17-sai.

Two high school students, Hiroki and Takashi, are saved from bullying by a gangster named Miyamoto and become part of his group. Initially pleased with the protection he offers, they soon realize that membership demands loyalty and obedience, with serious repercussions for disobedience. As they become involved in increasingly violent acts, they kidnap a girl named Sachiko. Hiroki now struggles with the conflict between self-preservation and guilt. Meanwhile, Sachiko's twin sister Miki, along with her parents and the police, search for her. The story explores the consequences of the crime and the impact on those involved.