From Fujoshi Bitches:
As a good-looking university student, Atsushi freely enjoys purely physical relationships. He believes the likes of serious love to be nothing but trouble… until he watches his friend Niinobe masturbating. Alone together in the swim club clubroom, Atsushi feels an urge he has never felt before for the guy releasing himself and who pleads to him,”I want you to watch my debauchery, with an enticing look on his face.