Catharisis (カタルシス) is a made for TV Japanese film made in 2003 based on a true story, starring Rikiya Otaka and directed by Katsumi Sakaguchi.
Naoki Ono, a 14-year-old boy murders a young girl in the suburbs of Tokyo.
As a result, the large family change their names and live apart, while Naoki goes to a reformatory.
Three years later, Towako requests that the families reunites and go the island of her birth to be with her dying mother.
Katsumi, Naoki's sister hasn't been able to speak since her brother murdered the girl.