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The Ramparts of Ice
The Ramparts of Ice (Japanese: 氷の城壁, Hepburn: Kōri no Jōheki) is a Japanese web manga series written and illustrated by Kōcha Agasawa. It was first published as a webtoon under the Line Manga Indies section, and after collaborating with the Margaret editorial team, it was picked up for official serialization through the Line Manga digital service from January 2020 to April 2022. Shueisha published its chapters in 14 tankōbon volumes from July 2023 to February 2025.
The series follows Koyuki Hikawa, an introverted high schooler who keeps her distance from others, until three of her schoolmates draw her out and help her enjoy her adolescence to the fullest.
An anime television series adaptation produced by Studio Kai aired from April to July 2026. A second season is set to premiere in October of the same year.
High school student Koyuki Hikawa has trouble interacting with others, instead preferring to keep her distance and spend her time alone. However, when she meets Minato Amamiya, he suddenly starts trying to close the distance between them.
Written and illustrated by Kōcha Agasawa, The Ramparts of Ice began publication as a self-published webtoon under the Line Manga Indies section for about two years, before the author was contacted by the Margaret editorial department, who facilitated its official serialization through Line's Line Manga digital service, being published from January 10, 2020, to April 28, 2022. Shueisha published the manga in print, under its Jump Comics imprint, with 14 tankōbon volumes released from July 4, 2023, to February 4, 2025.
The series is published in English on NTT Solmare's MangaPlaza website.
In January 2025, it was announced that the manga would receive an anime television series adaptation. It is produced by Studio Kai and directed by Mankyū, with series composition by Yasuhiro Nakanishi, characters designed by Miki Ogino, and music composed by Kanade Sakuma and Natsumi Tabuchi. The series aired from April 2 to July 2, 2026, on TBS and its affiliates. The opening theme song is "Tōmei" (透明; 'Invisible'), performed by Novelbright, while the ending theme song is "Sakasama" (逆様; 'Upside Down'), performed by Polkadot Stingray. Netflix is streaming the series globally.
Following the airing of the first season's finale, a second season was announced, and is set to premiere on October 1 of the same year.
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The Ramparts of Ice
The Ramparts of Ice (Japanese: 氷の城壁, Hepburn: Kōri no Jōheki) is a Japanese web manga series written and illustrated by Kōcha Agasawa. It was first published as a webtoon under the Line Manga Indies section, and after collaborating with the Margaret editorial team, it was picked up for official serialization through the Line Manga digital service from January 2020 to April 2022. Shueisha published its chapters in 14 tankōbon volumes from July 2023 to February 2025.
The series follows Koyuki Hikawa, an introverted high schooler who keeps her distance from others, until three of her schoolmates draw her out and help her enjoy her adolescence to the fullest.
An anime television series adaptation produced by Studio Kai aired from April to July 2026. A second season is set to premiere in October of the same year.
High school student Koyuki Hikawa has trouble interacting with others, instead preferring to keep her distance and spend her time alone. However, when she meets Minato Amamiya, he suddenly starts trying to close the distance between them.
Written and illustrated by Kōcha Agasawa, The Ramparts of Ice began publication as a self-published webtoon under the Line Manga Indies section for about two years, before the author was contacted by the Margaret editorial department, who facilitated its official serialization through Line's Line Manga digital service, being published from January 10, 2020, to April 28, 2022. Shueisha published the manga in print, under its Jump Comics imprint, with 14 tankōbon volumes released from July 4, 2023, to February 4, 2025.
The series is published in English on NTT Solmare's MangaPlaza website.
In January 2025, it was announced that the manga would receive an anime television series adaptation. It is produced by Studio Kai and directed by Mankyū, with series composition by Yasuhiro Nakanishi, characters designed by Miki Ogino, and music composed by Kanade Sakuma and Natsumi Tabuchi. The series aired from April 2 to July 2, 2026, on TBS and its affiliates. The opening theme song is "Tōmei" (透明; 'Invisible'), performed by Novelbright, while the ending theme song is "Sakasama" (逆様; 'Upside Down'), performed by Polkadot Stingray. Netflix is streaming the series globally.
Following the airing of the first season's finale, a second season was announced, and is set to premiere on October 1 of the same year.