Samonji, a reporter, receives a message on his answering machine from his friend Takada that says "stop it... zero plan! February." Learning that Takada is dead, Samonji begins an investigation. He and his younger sister Fumiko investigate major events happening in February but cannot find anything relevant. Meanwhile, Kanzaki, a doctor who works at a clinic on a remote island, is working on a plan to extort two billion yen.

Toshio Kurosawa
as Samonji

Naomi Hase
as Fumiko Samonji

Junkichi Orimoto
as Inspector Yabe

Ryuji Katagiri
as Jiro Taketani

Kazunaga Tsuji
as Hiramatsu

Toshitaka Itō
as

Yūsuke Kazato
as Shintaro Kato

Kenji Sahara
as Arai

Minoru Hodaka
as

Yoshirō Kitahara
as