With graduation 10 days away, homeroom teacher Hiiragi gathered all 29 students of class 3-A and proclaims them his hostages. His last lesson regards the death of a student that passed away a few months before. Nobody will be able to graduate until the truth is known.
Masaki Suda
Mei Nagano
Moka Kamishiraishi
Ryota Katayose
Rina Kawaei
Mio Imada
Haruka Fukuhara
Kaito Mifune
Mayuu Yokota
Aki Moriyama
Riku Hagiwara
Hikari Tobita
Aina Sakuraba
Yuki Imai
Nana Mori
Yumena Yanai
Mayu Hotta
Fuju Kamio
Shiori Akita
Yuno Ohara
Jin Suzuki
Jiei Wakabayashi
Kenjiro Nishimoto
Yamada Himena
Ayumu Mochizuki
Miu Tomita
Takara Sakumoto
Tsuyoshi Furukawa
Mikoto Hibi
Yume Shinjo
Yuki Takao
Kohei Otomo
Kippei Shiina
Yoshihiko Hosoda
Seiichi Tanabe