Ruriko's father is a well known scientist who's involved in secret research that even his family doesn't know about. Ever since he moved up to the research laboratory in Hokkaido, Ruriko hasn't heard from him. The only thing that reminded her of his warmth was the green music box that he’d left behind for her. She longed to reunite with her father. The little box played music that lifted her spirits, to a place where everything was perfect.

A detective sets out on a manhunt to catch a murderer before the crime's statue of limitations runs out.

A unique and controversial film directed by Umeji Inoue, based on the original story by Shintaro Ishihara, which depicts the image of a group of young people in the agony of mistrust, love and hate with a powerful touch.