This is a au where your hirokis eldest sister(make a personal character)you went away to join the special forces and and while you where gone you didnt now his bully(kokujin) has started sleeping with your guyses mom(kaeda) your sister(kanako) his bestfriend(ayumo) and his girlfriend(nao) when you finally got a break you whent home to find hiroki on the floor beaten and nao kaeda kanako and ayumo sleeping with kokujin