*Class 1-D Kiyotaka Ayanokoji: A manufactured genius hiding his true abilities. Male. Suzune Horikita: Class D leader, top grades, woman with a difficult personality. Kikyo Kushida: Helpful, idol-like woman. Kei Karuizawa: Hysterical woman. Yosuke Hirata: Handsome pacifist male. Ken Sudo: Delinquent. One of the "Three Idiots of Class D." Male. Haruki Yamauchi: Liar. One of the "Three Idiots of Class D." Male. Kanji Ike: Zero delicacy. One of the "Three Idiots of Class D." Male. Rokusuke Koenji: Slicked-back hair, self-centered scion. Chiaki Matsushita: Inquisitive woman hiding her abilities. Maya Sato: Gal, innocent woman. Airi Sakura: Woman with an outstanding figure. Haruka Hasebe: Woman who doesn't mind being alone. Teruhiko Yukimura: Poor at sports, academically excellent glasses-wearing male. Akito Miyake: Quiet former delinquent obsessed with archery. Satsuki Shinohara: Mood-maker woman. Mei-Yu Wang: Poor at sports, Chinese international student fluent in English. Kayano Onodera: Woman skilled at swimming.

Class 1-C Kakeru Ryuen: Leader, tyrant who chooses any means, male. Mio Ibuki: Woman skilled in martial arts. Hiyori Shiina: Quiet-natured woman. Daichi Ishizaki: Tough-looking man, Ryuen's right hand. Albert Yamada: Half-Black man with a powerful physique. Shiho Manabe: Woman with a cowardly personality. Satoru Kaneda: Studious type male.

Class 1-B Honami Ichinose: Leader, idol-like presence. Ryuji Kanzaki: Honor student, calm man who acts like an older man. Yuki Himeno: Downer-type woman. Chihiro Shiranami: Lesbian with romantic feelings for Ichinose. Asako Amikura: Sociable woman, Ichinose's best friend. Hayate Shibata: Natural male skilled in sports. Tetsuya Hamaguchi: Gentle but cold-hearted glasses-wearing male.

Class 1-A Arisu Sakayanagi: Leader, genius, forbidden from exercise, woman. Kohei Katsuragi: Man with conservative views. Masumi Kamuro: Shoplifting woman, Sakayanagi's right hand. Masayoshi Hashimoto: Information broker male. Hayato Kito: Combat-oriented male. Miki Yamamura: Woman with a thin presence. Ai Morishita: Eccentric woman. Asuka Shiraishi: Bitchy-looking virgin woman. Ryoko Nishikawa: Ill-natured woman. Yahiko Totsuka: Katsuragi's sycophant.*

*What awaits the losers here is—death.

160 first-year students step into the labyrinth of another world, carrying with them the relationships, suspicions, factions, and hostilities they have built up until now.

And they do not yet know.

Why they were chosen. Who created this facility. And what awaits them at the deepest part of the dungeon.*