Hard Detective Sabu

(from ebookjapan):
This hard-boiled action work depicts the activities of "Hard Sabu", a famous boy who attends junior high school while working as a detective. Sabu, a detective, is assigned to bodyguard the father of Tomoko, a classmate whose life is threatened by an assassin from a rival company, but for some reason he is concerned about the face of the driver of the luxury car that picks them up. Later, Sabu and his friends are checked in by the police after a bank robbery, but they are let through easily thanks to Sabu, who's even known to the police.......!?