Hiroki Wakabayashi is an ordinary high school student who is in love with Kaori, a cute beautiful woman older than him. Their relationship progresses gently and lightly. Meanwhile, cases of serious bullying are taking place at Hiroki's high school. They are called "Suicide play", where the bullied child is driven to suicide. But in this world is the world of immortality! In this world without death, the bullied child cannot die. In this world, when people die, they are revived, unable to escape from bullying.

Yes, in the first part 'Hound' we have been following the story from the Police Force's point of view. Now, in the new series 'Ridge' will be telling the story from the vectors' perspective!