After committing a terrible sin in a past life, the spirit of the former gang leader Akio Tanaka is reborn with a mission. Facing the repercussions for a life of crime, Akio must act as a guardian over Yui Murakami, a kind girl with a painful home life, if he ever hopes to become mortal again. However, he soon discovers that ending his eternity of atonement comes at an impossible price, one he may not ever be able to afford. As Akio watches over the youthful Yui, he discovers the plot of the evil spirit Shinigami and his army of Yokai who want to claim Yui's soul. Will Akio be able to save Yui's soul from the Shinigami? Will he be willing to pay the price for his freedom?