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Hen Semi
Hen Semi
from Wikipedia
Hen Semi
Cover of the first manga volume
変ゼミ
GenreComedy[1]
Manga
Written byTAGRO
Published byKodansha
MagazineMonthly Morning Two
Original runDecember 21, 2006June 22, 2015
Volumes11
Original video animation
Directed byRyouki Kamitsubo
Produced by
  • Yūichi Yamada
  • Fumitake Kobayashi
Written byTakamitsu Kōno
Music byKei Haneoka
StudioXebec
Released July 23, 2010 March 23, 2011
Episodes2
Anime television series
Directed byTakao Kato
Produced by
  • Yūichi Yamada
  • Gō Nakanishi
Written byTakamitsu Kōno
Music byMasaru Yokoyama
StudioXebec
Original networkMBS, AT-X, BS11 Digital, Tokyo MX
Original run April 3, 2011 July 3, 2011
Episodes13 (List of episodes)

Hen Semi (変ゼミ, Hen Zemi), also known as Abnormal Physiology Seminar, is a Japanese comedy manga series written and illustrated by TAGRO and is a remake of his earlier manga series, Hentai Seiri Seminar (変態生理ゼミナール, "Abnormal Physiology Seminar"). Hen Semi has been serialized in Kodansha's Monthly Morning Two manga magazine since 2006. It has been adapted into an original video animation in 2010,[2] as well as an anime television series in 2011.

Plot

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Nanako falls in love with Komugi and she joins a seminar which he enrolls, but the seminar is an abnormal seminar. Sexual harassment-like assignments and eccentric classmates confuse her.

Characters

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Nanako Matsutaka (松隆 奈々子, Matsutaka Nanako)
Voiced by: Kana Hanazawa
Nanako is a normal university student, who happened to enroll in Abnormal Physiology Seminar. She tries to keep her mental state sound, but other abnormal classmates start to influence her personality...
Komugi Musashi (武蔵 小麦, Musashi Komugi)
Voiced by: Akira Ishida
Nanako has a crush on him. He is a handsome young man, and also a very straightforward person who is not afraid to discuss his perversions, much to the displeasure of others nearby. He also has a Netorare fetish.
Miwako Mizukoshi (水越 美和子, Mizukoshi Miwako)
Voiced by: Yukiko Takaguchi
Komugi's ex-girlfriend. She is a beautiful woman, but also a masochist and often gets lost in wild sexual fantasies.
Anna Katō (加藤 あんな, Katō Anna)
Voiced by: Ryōko Shintani
A new student from Kanazawa, Ishikawa. She looks like a delinquent, but actually has a split personality. She was originally a sadist to her little brother.
Yesterday Taguchi (田口 イエスタディ, Taguchi Iesutadi)
Voiced by: Minoru Shiraishi
A dissolute student who wants to be a manga artist. He is in a codependency relation with Makiko.
Makiko Gregory (蒔子=グレゴリー, Makiko Guregorī)
Voiced by: Shiho Kawaragi
An elusive blonde student who is half British and half Japanese. She is an assistant of Yesterday.
Hishiyasu Ichikawa (市河 菱靖, Ichikawa Hishiyasu)
Voiced by: Norihisa Mori
A punk rock and otaku style student who films other people's perversions. He is also a mysophobe.
Kenji Meshiya (飯野 堅治, Meshiya Kenji)
Voiced by: Takashi Matsuyama
The seminar's professor. He looks like Kenji Eno.
Yūji Horii (堀井 幽璽, Horii Yūji)
Voiced by: Kenjiro Tsuda
Kenji's senpai who sometimes asks him for money despite being a wealthy man. He is famous for having developed an eroge. He looks like Yuji Horii. Miwako later dates him.

Media

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Manga

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Hentai Seiri Seminar appeared serially in 5 episodes in Wanimagazine's hentai manga magazine Comic Kairakuten, and it was contained on a collection of TAGRO's short stories in 2004 by Daitosha. Hen Semi was first serialized in Kondansha's seinen manga magazine Morning 2 in 2006. As of August 2011, 5 volumes have been released.

Original video animation

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The first volume was released with the limited edition of volume four of the manga on July 23, 2010; and the second volume was released with the limited edition of volume five of the manga on March 23, 2011. The opening theme is "Maniaekirakira (マニアエキラキラ)" by Nobuhiro Makino (composition and arrangement), Hitomi Mieno (lyrics), and Kana Hanazawa (vocals) and the ending theme is "Hen Rin Shan; Hen da yo. Rinsū no Ato ni Shanpū te (変・リン・シャン 〜変だよ。リンスーの後にシャンプーて〜; "Hen Rin Sham; It's abnormal to shampoo after rinse")" by Ataru Sumiyoshi (composition and arrangement), Hitomi Mieno (lyrics), and Kana Hanazawa, Minoru Shiraishi, Norihisa Mori, Takashi Matsuyama (vocals).

Anime television series

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In December 2010, an anime television series adaptation of Hen Semi was announced on Kodansha's website.[1] Produced by Xebec under the direction of Takao Kato and scripts by Takamitsu Kōno, the series began its broadcast between April 3 to July 3, 2011 on MBS. The duration of the episodes is half of that of a regular anime episode: 12 minutes instead of 24 minutes.

The opening theme is a non-lyric song "Hen Zemi Hajimaru yo! (変ゼミ始まるよ!; "Hen Semi Will Start!")" by Masaru Yokoyama and the ending theme is "Punctuation!" by Hajime Kikuchi (composition and arrangement), Hitomi Mieno (lyrics), and Kana Hanazawa (vocals).

No. Title Original airdate
1"Study on the World Events as Seen from Unbiased Advocates"
Transliteration: "Fuhen-ron-sha-tachi Kara Mita Sekai no Jishō ni Kansuru Kōsatsu" (Japanese: 不偏論者たちから見た世界の事象に関する考察)
April 3, 2011 (2011-04-03)[3]
2"Study on the Hedonistic Aspects of Food and Taste"
Transliteration: "Shoku to Shikō kara Miru Kairaku Yōsō ni Kansuru Kōsatsu" (Japanese: 食と嗜好から見る快楽様相に関する考察)
April 17, 2011 (2011-04-17)[4]
3"Study on the Sense of Virtue in Social Comparison"
Transliteration: "Shakai-teki Hikaku ni okeru Teisō Kannen ni Kansuru Kōsatsu" (Japanese: 社会的比較における貞操観念に関する考察)
April 25, 2011 (2011-04-25)[4]
4"Study on the Difference in Happiness and that of the Person Receiving the Service to the Population"
Transliteration: "Shūdan e no Hōshi-sha to Sore o Juyōsuru Gawa no Kōfuku-kan no Sai ni Kansuru Kōsatsu" (Japanese: 集団への奉仕者とそれを受容する側の幸福感の差異に関する考察)
May 1, 2011 (2011-05-01)[4]
5"Study on the Family Dynamics that Influence Personality Development"
Transliteration: "Kazoku Kinō ga Jinkaku Keisei ni Ataeru Eikyō ni Kansuru Kōsatsu" (Japanese: 家族機能が人格形成に与える影響に関する考察)
May 8, 2011 (2011-05-08)[4]
6"Study on the Impulsive Action and Threatened Action in Extreme Conditions"
Transliteration: "Kyokugen Jōtai ni Okeru Shōdō Kōi to Kyōhaku Kōi ni Kansuru Kōsatsu" (Japanese: 極限状態における衝動行為と脅迫行為に関する考察)
May 15, 2011 (2011-05-15)[5]
7"Study on the Relationship Between Direct and Reliable to Depend on the Specific Relationship"
Transliteration: "Tokutei no Ningen Kankei e Mukeru Izon-sei to Shinrai-sei no Kankei ni Kansuru Kōsatsu" (Japanese: 特定の人間関係へ向ける依存性と信頼性の関係に関する考察)
May 22, 2011 (2011-05-22)[5]
8"Study on the Characteristic Quality and the Sense of Self-growth by Childhood Experiences"
Transliteration: "Yōji Taiken ga Ataeru Tokushitsu-teki Seishitsu to Jiko Seichō-kan ni Kansuru Kōsatsu" (Japanese: 幼児体験が与える特質的性質と自己成長感に関する考察)
May 28, 2011 (2011-05-28)[5]
9"Study on the Self-observation and Self-disclosure Subjective"
Transliteration: "Shukan-teki Jiko Kansatsu no Kekka to Jiko Kaiji ni Kansuru Kōsatsu" (Japanese: 主観的自己観察の結果と自己開示に関する考察)
June 5, 2011 (2011-06-05)[5]
10"Study on the Psychological Impact of Indirect Contact"
Transliteration: "Kansetsu-teki na Sesshoku ni Yoru Shinri-teki Eikyō ni Kansuru Kōsatsu" (Japanese: 間接的な接触による心理的影響に関する考察)
June 12, 2011 (2011-06-12)[6]
11"Study on the Psychological and Physical Effects of Suppressed Desires"
Transliteration: "Yokuseisareta Yokkyū ga Oyobosu Shinri-teki Oyobi Shintai-teki Kōka ni Kansuru Kōsatsu" (Japanese: 抑制された欲求が及ぼす心理的及び身体的効果に関する考察)
June 19, 2011 (2011-06-19)[6]
12"Study on Coping With a Particular Expression of Love From Someone"
Transliteration: "Tokutei no Jinbutsu kara no Aijō Hyōgen e no Taisho Kōdō ni Kansuru Kōsatsu" (Japanese: 特定の人物からの愛情表現への対処行動に関する考察)
June 26, 2011 (2011-06-26)[6]
13"Study on Impartial Advocates Harbouring 'Love'"
Transliteration: "Fuhen-ron-sha-tachi ga Idaku “Ai” ni Kansuru Kōsatsu" (Japanese: 不偏論者たちが抱く「愛」に関する考察)
July 3, 2011 (2011-07-03)[6]

Internet radio show

[edit]

A weekly internet radio show titled Hen Lab (変ラボ, Hen Rabo) began airing on March 15, 2011 on Animate TV. It is co-hosted by Minoru Shiraishi, Norihisa Mori and Takashi Matsuyama.[7]

References

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[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia
from Grokipedia
Hen Semi (変ゼミ, Hen Zemi), also known as Abnormal Physiology Seminar, is a Japanese comedy manga series written and illustrated by TAGRO. Serialized in Kodansha's Morning 2 magazine from December 21, 2006, to June 22, 2015, the series spans 11 tankōbon volumes and centers on Nanako Matsutaka, an ordinary university student who inadvertently joins the Abnormal Physiology Seminar, a course exploring bizarre human behaviors and perversions led by the eccentric professor Kenji Meshiya. The narrative follows Nanako's efforts to maintain her sanity amid her classmates' increasingly deviant and absurd antics, blending dark humor with satirical takes on psychological abnormalities. The manga is a remake of TAGRO's earlier work Hentai Seiri Seminar, expanding on its themes of sexual and physiological oddities within an academic setting. It contains intense objectionable content including explicit depictions of perversion. Hen Semi was adapted into anime formats, beginning with two original video animation (OVA) episodes released on July 23, 2010, and March 23, 2011, produced by Xebec. These OVAs, each approximately 26 minutes long, faithfully capture the manga's comedic and erotic elements, focusing on Nanako's struggles in the seminar environment. A television anime series followed, airing 13 episodes from April 8, 2011, to July 1, 2011, also by Xebec, which further develops the seminar's bizarre experiments and character interactions. The adaptations maintain the source material's niche appeal, targeting audiences interested in unconventional comedy.

Synopsis and characters

Plot

Nanako Matsutaka, a typical freshman, enrolls in the primarily to stay close to her crush, Komugi Musashi, unaware that the course centers on the academic study of sexual perversions and fetishes under the guidance of the eccentric Kenji Meshiya. The seminar's curriculum requires students to research, report on, and sometimes demonstrate various deviant behaviors, thrusting Nanako into an environment filled with awkward and often explicit discussions that challenge her sense of normalcy. The narrative unfolds episodically, with each chapter or segment focusing on a specific topic, such as , masochism, or related to undergarments, where students present findings drawn from personal experiences or observations, leading to comedic mishaps and Nanako's frantic efforts to preserve her sanity. Interactions among the classmates, many of whom embrace their own peculiarities, escalate the humor through group activities and debates that blur the lines between scholarly inquiry and personal indulgence, gradually drawing Nanako from initial horror to tentative involvement in the proceedings. As the story progresses, the seminar culminates in collaborative projects that reveal underlying motivations among participants, emphasizing themes of abnormality versus in a lighthearted, satirical tone, while Nanako navigates her evolving relationships and self-perception within this unconventional academic setting.

Characters

Nanako Matsutaka is the , a strait-laced and innocent college freshman who enrolls in the Abnormal Physiology Seminar primarily to pursue her crush on a fellow student, despite her lack of interest in the course's perverse themes. Her internal monologues often convey shock and endurance amid the seminar's eccentric activities, highlighting her role as the normative viewpoint character in the comedic narrative. Voiced by in the adaptations, Nanako's development revolves around her attempts to maintain composure while navigating the group's abnormalities. Komugi Musashi serves as Nanako's object of affection and a key catalyst for her involvement in the seminar; he is a quiet, otaku-like senior student with a handsome exterior that conceals a range of hidden perverse interests, including panty theft and netorare fetishes. Straightforward in discussing his quirks despite his elusive and mischievous demeanor, Komugi frequently teases Nanako, complicating their unrequited dynamic and fueling much of the series' humor through his relaxed attitude toward crude topics. Voiced by in adaptations, his senior status and dark humor underscore his pivotal role in drawing Nanako into the group's interactions. Professor Kenji Meshiya is the eccentric and overtly perverted instructor of , whose authoritative yet deviant personality drives the absurd assignments exploring extreme fetishes, positioning him as the central antagonist-protagonist who encourages the students' explorations for "scientific" purposes. His interactions with the class often blend mentorship with provocation, amplifying the comedic tension through his diverse personal interests and unapologetic demeanor. Voiced by Takashi Matsuyama in adaptations, Meshiya's influence shapes 's environment, creating opportunities for student rivalries and revelations. The supporting classmates each embody distinct "abnormalities" that contribute to the ensemble's comedic effect, with personalities tailored to specific fetishes. Miwako Mizukoshi is a beautiful, masochistic senior with a high tolerance for perverse scenarios, often displaying a cheerful acceptance of her interests while navigating past relationships within the group. Anna Katō, an aggressive former delinquent with tendencies and a complex persona, forms a notable bond with classmate Hishiyasu Ichikawa, her assertiveness adding to dynamics. Yesterday Taguchi, a voyeuristic aspiring with insecurities, shares a codependent romantic partnership with Makiko Gregory, collaborating on perverse artistic projects. Makiko Gregory, an elusive half-British student, complements Taguchi's obsessions through her mysterious and enabling behavior. Hishiyasu Ichikawa, characterized by unique quirks such as collecting figurines and a detached observational style, pretends romantic involvement with Anna to support her, enhancing group interdependencies. These relationships—ranging from Nanako's unrequited pursuit of Komugi to interpersonal and professor-led provocations—underpin the humor, with each character's traits providing contrast and escalation without overlapping narrative events.

Adaptations

Manga

Hen Semi (変ゼミ, Hen Zemi), also known as Abnormal Physiology Seminar, is a Japanese manga series written and illustrated by TAGRO. It was serialized in Kodansha's seinen manga magazine Monthly Morning Two from December 21, 2006, to June 22, 2015, with the series concluding at chapter 87. The chapters were collected into 11 tankōbon volumes published by Kodansha. The manga originated as a remake and expansion of TAGRO's 2004 doujinshi Hentai Seiri Seminar (Abnormal Physiology Seminar), which consisted of short stories published by Daitosha; the serialized version develops the core concepts into fuller storylines while shifting to a more youth-oriented format suitable for magazine publication. As a seinen , Hen Semi employs risqué humor centered on the episodic antics of the Abnormal , where students and faculty explore and present on various sexual perversions and fetishes through detailed reports and discussions, satirizing deviant behaviors alongside everyday life. The work features explicit illustrations of these themes, emphasizing bold and unconventional explorations of that distinguish it within Japanese . No official English-language release of the has been produced, limiting its accessibility outside , though it has garnered recognition in domestic manga communities for its unapologetic handling of taboo subjects.

Original video animation

The (OVA) adaptation of Hen Semi, titled Hen Zemi, consists of two s produced by the studio . The episodes were directed by Ryouki Kamitsubo, who also handled storyboarding and episode direction for both installments. The first episode premiered on July 23, 2010, bundled as a limited edition privilege disc with the fourth volume of the , while the second episode followed on March 23, 2011, bundled with the fifth volume. Each episode runs approximately 26 minutes and adapts early arcs from the , centering on the protagonist Nanako Matsutaka's entry into the Abnormal Physiology Seminar and her encounters with its eccentric members and assignments. The OVA tones down some of the 's more explicit elements to align with animation distribution standards, while incorporating minor original scenes to improve narrative flow and pacing. As the first animated iteration of the series, it features higher per-episode production values compared to the subsequent television adaptation, emphasizing detailed and comedic timing in the seminar's bizarre scenarios. Key production staff included music composer Kei Haneoka, responsible for the score that underscores the series' humorous and risqué tone. The opening theme, "Mania e Kirakira" (マニアエキラキラ), was performed by Kana Hanazawa, who also voices the lead character Nanako Matsutaka. The ending theme, "Hen ・ Rin ・ Sham Hen da yo. Rinse no ato ni Shampoo te" (変・リン・シャン~変だよ。リンスの後にシャンプーて~), features vocals by Hanazawa alongside the voice actors for supporting characters: Minoru Shiraishi as Yesterday Taguchi, Norihisa Mori as Hishiyasu Ichikawa, and Takashi Matsuyama as Kenji Meshiya. Additional principal cast members include Akira Ishida as Komugi Musashi, capturing the seminar's deviant dynamics.

Anime television series

The anime television series adaptation of Hen Semi consists of 13 episodes, each approximately 12 minutes long, and aired from April 8, 2011, to July 1, 2011. It was broadcast weekly on networks including MBS (starting April 9), AT-X, BS11, and , with the short episode format supporting the series' rapid-fire comedic style centered on absurd discussions. Produced by and directed by Takao Kato, with series composition by Takamitsu Kōno, the adaptation draws from the manga by TAGRO, covering chapters beyond the scope of the prior OVA to delve deeper into additional seminar scenarios and interpersonal dynamics among the eccentric cast. Character designs were provided by Sunao Chikaoka, ensuring visual continuity while fitting the television production. The opening theme is the instrumental track "Hen Zemi Hajimaru yo!" composed by , which underscores the show's offbeat tone without lyrics. The ending theme, "Punctuation!", is performed by . The voice cast retains the core ensemble from the OVA, including as Nanako Matsutaka, as Komugi Musashi, as Yesterday Taguchi, and Shiho Kawaragi as Makiko Gregory. In adapting the manga's risqué content for broadcast, the series emphasizes verbal explorations of perversions and fetishes through dialogue and implications, toning down explicit visual elements to align with television standards while incorporating episode recaps and cliffhangers for ongoing viewer engagement. Building directly on the OVA's events, it expands the narrative of Nanako's experiences in the Abnormal Physiology Seminar.

Reception and legacy

Critical reception

The original video animation (OVA) adaptation received higher acclaim for its superior animation quality and detailed execution of the source material's humor, outperforming the later television series in fidelity to the manga's tone. In contrast, the TV series was faulted for rushed pacing and abbreviated runtime, resulting in lower overall scores, such as 5.2/10 on for the 2010–2011 mini-series and 5.5/10 for the 2011 version. Thematically, the series explores the normalization of abnormal behaviors through comedic exaggeration, steering clear of overt elements while subverting or indulging in genre tropes, leading to divided opinions on its execution—some viewing it as innovative , others as indulgent . On , user ratings reflect this divide, with the OVA averaging 6.275 (decent) and the TV series 5.984 (mediocre), highlighting its "bizarre yet endearing" portrayal of academic eccentricity.

Popularity

The OVA adaptation of Hen Semi holds a MyAnimeList score of 6.47 based on 11,573 user ratings as of November 2025, while the television series scores 6.49 from 18,538 ratings as of November 2025, reflecting a niche appeal among fans of unconventional comedy. These modest scores underscore its targeted following, particularly among viewers who appreciate its "WTF" moments of absurd and shocking humor, as highlighted in user reviews comparing it to more experimental works like FLCL but noting its restricted 17+ rating for explicit content. Discussions on platforms like MyAnimeList emphasize its rewatch value for those drawn to psychological and boundary-pushing comedy, though it remains far from mainstream acclaim. Manga circulation has been modest, with volumes primarily circulating through Japanese domestic markets and second-hand sales rather than blockbuster performance, peaking in interest around the 2010 anime announcement but without entering major sales rankings like charts. Internationally, there has been no widespread physical release, limiting accessibility, though the anime is available on select streaming platforms such as Plex and Animegg.org in limited regions, without presence on major services like . The fanbase maintains cult status due to the series' bold, unapologetic exploration of absurd and humor, appealing primarily to audiences interested in psychological that blends relatability with discomfort. Limited official merchandise exists, attributable to the controversial themes involving perversion and eccentricity, yet forums praise the characters' grounded relatability amid the chaos, fostering a dedicated but small . This enduring weirdness is occasionally revisited in retrospective discussions, such as 2023 analyses labeling it an obscure gem of ero-dementia . In terms of legacy, Hen Semi has subtly influenced niche absurd comedies through its unfiltered portrayal of deviant seminar antics. In 2019, creator TAGRO announced a one-shot chapter for the , published in the 2020 issue of Morning Two, extending the story beyond its 2015 conclusion. As of November 2025, no official revivals or further adaptations have materialized, with its impact confined to inspirational echoes in similar boundary-testing works rather than direct successors.

Internet radio show

To promote the television anime adaptation of Hen Semi, a weekly program titled Hen Lab (変ラボ, Hen Rabo) aired on Animate TV beginning on , 2011. The show, subtitled "Abnormal Laboratory," was hosted by voice actors as Yesterday Taguchi, Norihisa Mori as Hishiyasu Ichikawa, and Takashi Matsuyama as Kenji Meshiya, all portraying male characters from the seminar. Episodes typically ran 20 to 30 minutes and centered on discussions of the series' themes of abnormality and perversion in , sharing production anecdotes, and engaging with listener-submitted emails. A key segment, "Hen Mail" (へんおた), highlighted the most eccentric listener contributions, awarding the "highest deviation value" (高変差値) to the weirdest entry to tie into the manga's humorous exploration of deviance. Hosts also performed comedic skits parodying the perverse dynamics of the Abnormal , emphasizing the cast's playful interactions while avoiding major plot spoilers. The program aligned closely with the anime's broadcast schedule on networks like MBS and , running concurrently to generate pre-air buzz. Special episodes featured guest appearances by other cast members, such as voicing Komugi Musashi, which were later compiled into DJ CDs alongside episode highlights and original recordings released in volumes like Henban vol.1 (July 2011) and vol.2 (October 2011). Episodes were archived on Animate TV for on-demand access following initial streams, though availability ended with the service's discontinuation in 2013. Through its format and focus on the hosts' chemistry, Hen Lab fostered fan engagement by humanizing the voice cast and amplifying the series' eccentric appeal ahead of and during the anime's run.

Music

The music for Hen Semi emphasizes quirky, upbeat tracks that align with the series' comedic tone, using playful melodies to satirize perversion topics while maintaining a lighthearted feel despite the dark humor, and incorporating sound effects to accentuate absurd moments. For the original video animation (OVA), the overall score was composed by Kei Haneoka, who crafted a mix of rock, , , and ambient sounds to support the exaggerated scenarios. The OVA's opening theme is "Mania e Kirakira" performed by , with composition by Nobuhiro Makino and arrangement by Ataru Sumiyoshi. Its ending theme, "Hen Rin Sham Hen da yo. Rinse no ato ni Shampoo te," features vocals by alongside cast members , Norihisa Mori, and Takashi Matsuyama, composed and arranged by Ataru Sumiyoshi. The television series score was composed by , continuing the upbeat and eclectic style with instrumental pieces and effects that highlight the show's pervy gags. The TV opening theme is the non-lyrical instrumental track "Hen Zemi Hajimaru yo!" composed by Yokoyama himself, featuring a catchy rock beat. The ending theme is the vocal version of "Punctuation!" performed by , with composition and arrangement by Hajime Kikuchi. Original soundtrack material was released in 2011 as part of the DJ CD series Henban, such as *Hen Zemi Hen-Ban Vol. 1 Hentai Kourin, Boku Zetsurin! (July 2011), which includes BGM, theme song versions, and radio episodes. Theme songs also appear on singles like the 2011 "Punctuation!" CD and are included in the anime's Blu-ray releases. The associated show, Hen Lab, featured insert songs and cast covers of the themes, with related audio content bundled in these promotional CDs.

References

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