Shuhei is leading a tough life. His alcoholic mother Akiko can only hook up with bad guys and order Shuhei to go get money from his disapproving grandparents instead of going to school. Except raising the little half-sister, his rock-bottom life seems to have no end.
Taken in by the yakuza at a young age, Kenji swears allegiance to his old-school boss, pledging to adhere to the family code amid ever-changing times.
Chiwawa is a popular girl. One day, her dismembered body is found in Tokyo Bay. Chiwawa's friends gather to remember her, but they realize they do not know anything about her background or even her real name.