Moonlight Mask - Claws of Satan

Ninth and final film in the Boy Detectives Club series. Features Tatsuo Umemiya's film debut.

When an alien force tries to invade Earth to steal a powerful new rocket fuel, a mysterious hero intervenes.

The son of the murdered Yakuza, Kenji, at the request of his mother, worked in a stable company. However, soon the girl Kenji Amy, who was in favor of the director of the company, is sexually harassed by him. Kenji beats the director and resigns. He asks his brother Ryota, the manager of the cabaret, to find a job, but his brother refuses him, and he is taken in by Senba, a yakuza boss specializing in smuggling and drugs...