18 岁的小山内（铃木福 饰）收到大学录取通知书的当天，父亲因深陷电信诈骗圈套、背上巨额债务而选择自尽。他只得放弃升学，四处筹钱糊口，最终竟做起了当初逼死父亲的黑工。
某天，小山内接下了报酬最高的一单绑架活计，可他浑然不知，这份工作早已暗中追加了任务 —— 杀害目标人物若叶樱子（圆井湾 饰）并抛尸荒野。一行人将少女带到林中，就在动手行凶的刹那……！！

Problems with the neighborhood? Grandmother Yang and her two slightly mentally challenged grandchildren solve them in their very own way. Her neighbor Kazuya not only has to take care of the clan's legacy, but also his disabled sister, and all of them have to deal with the Sea Snakes gang who wants to compete with the Yang family.