Hisashi Ueno

Luchino's routine morning elevator ride up from her subterranean home on level 138 to her school many stories above turns horrific when the elevator operator is ordered to pick up two passengers from floor 99, the maximum security level. What starts as psychological manipulation soon turns wholly physical as both the cruel convicts and Luchino's own dysfunctional past are unleashed. And then every passenger must fight for his or her survival.

After witnessing a gang murder, 12 year old Masashi asks his father what he'd do if he were killed by a Yakuza. "Exact vengeance," his father promptly replies. The next day, in an unfortunate turn of fate, Masashi's father is hospitalized with serious injuries, leaving Masashi to fend for himself in a bad and violent part of town. Luckily, he is taken in by a generous family who decides to help him. However, Masashi soon discovers that the father of this family, has a rather bad reputation.