On the surface, Jin Kanzaki may appear to be a typical street urchin, yet he holds supernatural strength that he employs for the benefit of others, or at least that is what his grandfather hopes. To his grandfather's dismay, the boy insists on receiving 10,000 yen for each good deed he performs. However, Jin's simple existence is abruptly disrupted when he comes across a Player, a lethal entity potentially linked to several mysterious killings. As Jin tries to handle the situation by punching through every barrier, a group of enigmatic men frantically pursue an individual bearing a ring-shaped mark on their hand. As their investigation progresses, various secrets about the world start to emerge—and it appears that Jin himself could be the key to solving the mystery.