Jin Kanzaki is poor, but he lives a happy life with his grandfather. Together with his friends Kouga and Konoha, he helps out people for a fee. Meanwhile, the police are searching for a vicious serial killer. Jin comes home one day to find his grandfather lying in a pool of his own blood. Unable to understand that his grandfather is dead, Jin wanders the streets in shock. Unknown to Jin, he is next on the killer’s list!