2.5 Dimensional Seduction (Japanese: 2.5次元の誘惑（リリサ）, Hepburn: Nitengo-jigen no Ririsa; transl. "2.5 Dimensional Lilysa"), abbreviated as Nigoriri (にごリリ), is a Japanese manga series written and illustrated by Yu Hashimoto. It was serialized on Shueisha's Shōnen Jump+ website from June 2019 to December 2025, with its chapters collected in twenty-five tankōbon volumes. An anime television series adaptation produced by J.C.Staff aired from July to December 2024. A second season has been announced.

Masamune Okumura is a second-year high school student who serves as the president and only member of his school's manga club. An otaku, he claims he has no interest in real girls due to his obsession with a fictional character named Liliel (リリエル, Ririeru). Suddenly, a first-year student named Lilysa Amano, who is passionate about cosplay, joins the club and recruits Okumura to be her official photographer. When Okumura learns her favorite character is also Liliel, he starts to fall in love with her, making him feel conflicted. Other girls soon join the club as well, including Okumura's childhood friend Mikari Tachibana, whose unrequited love for him constantly leaves her frustrated.

Written and illustrated by Yu Hashimoto, the series was serialized on Shueisha's Shōnen Jump+ manga website from June 15, 2019, to December 20, 2025. Shueisha collected its chapters in twenty-five tankōbon volumes, released from October 4, 2019, to February 4, 2026.

In June 2021, Seven Seas Entertainment announced that they licensed the series for English publication under their Ghost Ship imprint.

An anime television series adaptation was announced on December 10, 2022. It was produced by J.C.Staff and directed by Hideki Okamoto, with scripts written by Takao Yoshioka, character designs handled by Tomoyuki Shitaya, and music composed by Hiroaki Tsutsumi. The series aired from July 5 to December 13, 2024, on Tokyo MX and other networks. For the first cour, the opening theme song is "Shutter Chance" (シャッターチャンス, Shattāchansu), performed by Meychan, while the ending theme song is "Watch Me", performed by Kaori Maeda and Akari Kitō as their respective characters. For the second cour, the opening theme song is "Tsugihagi no Tsubasa" (ツギハギの翼; "A Wing's Patchwork"), performed by Soraru, while the ending theme song is "Release Sigh", performed by Kaori Maeda, Akari Kitō, Sayumi Suzushiro and Sayumi Watabe as their respective characters. Sentai Filmworks licensed the series in North America, Australia and British Isles for streaming on Hidive.

Following the airing of the final episode, a second season was announced.

An online role-playing video game developed by Aiming and Team Caravan, titled 2.5 Dimensional Seduction: Angels on Stage (2.5次元の誘惑（リリサ） 天使たちのステージ, Nitengo-jigen no Ririsa Tenshitachi no Sutēji), was announced during Jump Festa 2024. It was released for iOS and Android on September 3, 2024. A PC version was released on October 31, 2024. The English and Simplified Chinese versions ended service on January 14, 2026.

Itachi Utada from Famitsu praised the story and characters of the series, particularly enjoying the cosplay elements present.