2.5 Dimensional Seduction

2.5 Dimensional Seduction (2.5次元の) is a Japanese manga series written and illustrated by Yu Hashimoto. It began serialization on Shueisha's Shōnen Jump+ website in June 2019. An anime television series adaptation produced by J.C.Staff premiered in July 2024.

Premise
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). 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 finds himself conflicted about his romantic feelings towards her. Other girls soon join the club as well.

Characters

 * Masamune Okumura (奥村 正宗)
 * Okumura is a second-year high school student who is the president of his school's manga club. He is an otaku who is obsessed with a fictional character named Liliel. His mother abandoned his family when he was young.
 * Okumura is a second-year high school student who is the president of his school's manga club. He is an otaku who is obsessed with a fictional character named Liliel. His mother abandoned his family when he was young.


 * Lilysa Amano (天乃 リリサ)
 * Lilysa is a first-year student who joins the manga club. Due to her passion for cosplay, she recruits Okumura to be her photographer. Like Okumura, she is also a fan of Liliel. She was first inspired to become a cosplayer when she visited a cosplay event.
 * Lilysa is a first-year student who joins the manga club. Due to her passion for cosplay, she recruits Okumura to be her photographer. Like Okumura, she is also a fan of Liliel. She was first inspired to become a cosplayer when she visited a cosplay event.


 * Mikari Tachibana (橘 美花莉)
 * Mikari is a first-year student who is Okumura's childhood friend and Lilysa's classmate. A gorgeous and popular model, she has had a crush on Okumura since they were young, though he has never noticed.
 * Mikari is a first-year student who is Okumura's childhood friend and Lilysa's classmate. A gorgeous and popular model, she has had a crush on Okumura since they were young, though he has never noticed.


 * 753♡
 * 753♡ is a professional cosplayer. Due to her popularity, she is considered to be one of the four Heavenly Queens of Cosplay.
 * 753♡ is a professional cosplayer. Due to her popularity, she is considered to be one of the four Heavenly Queens of Cosplay.


 * Magino (マギノ)
 * Magino is a cosplayer who is willing to give Lilysa and Okumura advice.
 * Magino is a cosplayer who is willing to give Lilysa and Okumura advice.


 * Ogino (オギノ)
 * Ogino is a photographer who hangs out with Magino. He serves as a mentor for Okumura.
 * Ogino is a photographer who hangs out with Magino. He serves as a mentor for Okumura.


 * Mayuri Hanyu (羽生 まゆり)
 * Mayuri is a popular new high school teacher who becomes the advisor of the manga club. She is a former cosplayer known as Mayura (まゆら), one of the four Heavenly Queens of Cosplay.
 * Mayuri is a popular new high school teacher who becomes the advisor of the manga club. She is a former cosplayer known as Mayura (まゆら), one of the four Heavenly Queens of Cosplay.


 * Nonoa (ノノア)
 * Nonoa is a rookie cosplayer who wants to be friends with Lilysa. However, she has trouble doing so due to her insecurity.
 * Nonoa is a rookie cosplayer who wants to be friends with Lilysa. However, she has trouble doing so due to her insecurity.


 * Aria Kisaki (喜咲アリア)
 * Aria is a new cosplayer who does not have much knowledge about anime and manga.
 * Aria is a new cosplayer who does not have much knowledge about anime and manga.

Manga
Written and illustrated by Yu Hashimoto, the series began serialization on Shueisha's Shōnen Jump+ manga website on June 15, 2019. As of July 2024, the series' individual chapters have been collected into twenty tankōbon volumes.

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

Chapters not yet in tankōbon format

 * 160. "Eli" (エリ)
 * 161. "The Future of Love" (愛のゆくえ)
 * 162. "Teacher's Decision" (先生の決断)
 * 163. "Next Strongest" (次の最強)
 * 164. "Luluna" (ルルナ)
 * 165. "Anime" (アニメ)
 * 166. "This Is Our Second Summer Camp!" (二度目の夏合宿ですっ！)
 * 167. "It's a Horror Escape Game!" (ホラー脱出ゲームですっ！)

Anime
An anime television series adaptation was announced on December 10, 2022. It is 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 premiered on July 5, 2024, on Tokyo MX and other networks, and will run for two consecutive cours. For the first cour, the opening theme song is "Shattāchansu" (シャッターチャンス), performed by Meychan, while the ending theme song is "Watch Me", performed by Kaori Maeda and Akari Kitō as their respective characters. Sentai Filmworks licensed the series in North America, Australia and British Isles for streaming on HIDIVE, and in Brazil and Mexico for streaming with local dub on Anime Onegai.

Video game
An online role-playing video game game developed by Aiming and Team Caravan, titled Nitengo-jigen no Ririsa Tenshitachi no Sutēji (2.5次元の 天使たちのステージ), was announced during Jump Festa 2024. It is set to be released for iOS, Android, and PC via DMM Games on September 3, 2024.

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

In the 2020 Next Manga Award, the series ranked fourth in the web manga category. The series has one million copies in circulation between its digital and print releases.