Chapter 1: The Grief of The Last Wolf

Ryouta is a boy who faced a dreadful past where his whole family was slaughtered by a group of hooligans brutally. Once it's safe, he found out that his whole house was massacred. Crying and grieving over their body, he took an oath for himself that he will find the killer and slaughter all of them just like how they slaughtered his family. His lament and wailing awaken something inside him, something he didn't know about at all. He and that "something" had one thing in common. To slaughter "them".