一发双中，父子齐射

 The story follows a nameless murderer, wearing a nightmarish mask, randomly murdering people across the U.S. in an attempt to secure his passage to hell. A patrolman’s pregnant wife, a fellow police officer, witnesses the killer murdering her husband and seeks to bring his to justice

大革族四大勇士之元泰、勇士昆布倒戈卖国投降，元泰引西暌族和南离皇族联军攻革，大革族族皇自杀身亡！蔡八儿提着七孔刀逃亡，在山林里救了被狼群养大的小男孩，蔡八儿为小男孩取名祖澈，蔡八儿和祖澈隐居十五年后，祖澈长练得一手好刀法，光复大革国。

　　担任临时教师的君岛穗香(涩谷凪咲)，目击了一个女学生从屋顶跳下的瞬间。当她在暑假补习班上课时，又注意到有个不应该存在的学生。不久后，穗香与补习班的三浦瞳(早濑憩)、前川武(山时聪真)等学生们，得知了与那个女学生有关的令人震惊的事实。