After the mysterious murder of his parents, Yoichi Sakagami struggled to live a normal life taking care of his young siblings. The only way he survived was by exploiting a mysterious ability he had to regenerate his organs. But when shadowy forces come after him, he'll find that there's more to his ability than he thought. Will he be able to control it to get his revenge and protect those he cares about? Or will the power he has control him instead?