Prologue.

Meet Arashiyama Junko, a 16 year friendly girl. She's the only daughter of an overprotective father who happens to be a leader of a fearsome yakuza group.

Meet Kurono Shun, a socially disconnected 16 year old boy who is mysteriously thrust into her life.

How will things pan out between the two? Will she accept his service or push the stranger away? Only one way to find out.