Atonement.

A father who is lazy with money. Kai, the son who always wipes his father's butt. He's a very healthy man. Even if his father sold him to a former male prostitute, Kai could not abandon his father. The person who kindly watches over him is Ryosuke, the owner of the beach house where the father and son suddenly drop by. Ryosuke tries to help Kai somehow, but...