A nerdy young college instructor named Shinji Kikyo returns home one day to find himself the target of a mad assassin. Surviving somewhat miraculously, he fends off other assassins and with the help of reporter Keiko Tsurumaki and car mechanic Bill Otomo, eventually discovering that a "population control" association is really an assassination squad led by Shogo Mizorogi, who has been training patients of a mental asylum to become killers.

Tatsuya Nakadai
as Shinji Kikyo

Reiko Dan
as Keiko Tsurumaki

Hideo Sunazuka
as Bill Otomo

Hideyo Amamoto
as Shogo Mizorogi

Tatsuyoshi Ehara
as Aochi

Yasuzō Ogawa
as Mabuchi

Masaya Nihei
as Pappy

Seishirō Kuno
as Man with crutch

Misako Tominaga
as

Atsuko Kawaguchi
as Yumie Komatsu