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Bai Xiaofei lived a dull, boring life. That all changes when, on his way to find his girlfriend, he meets a mutant with unprecedented power. As an ordinary human being, Xiaofei felt totally out of his depth; there was no way he could defeat powerful enemies and track down the cause of these strange mutations. After giving himself a shot of body enhancer bought online, however, he gradually reaches his potential.

Bem, Bela, and Belo are ugly humanoid youkai who fight for justice. They live among humans and protect them from evil youkai. The three find themselves ostracized from both humans and other youkai, but the three continue to fight in hopes of one day becoming humans themselves.

Surrounded by a forest and a gated entrance, the Grace Field House is inhabited by orphans happily living together as one big family, looked after by their "Mama," Isabella. Although they are required to take tests daily, the children are free to spend their time as they see fit, usually playing outside, as long as they do not venture too far from the orphanage—a rule they are expected to follow no matter what. However, all good times must come to an end, as every few months, a child is adopted and sent to live with their new family... never to be heard from again. However, the three oldest siblings have their suspicions about what is actually happening at the orphanage, and they are about to discover the cruel fate that awaits the children living at Grace Field, including the twisted nature of their beloved Mama.

Monsters are coming to the human world from the Hell in order to get human spirits. As people's minds are getting dirty, being attracted by the dirty spirits, the monsters break the rule to go to the human world. Tsutomu, a boy who goes to Yokai Elementary School, is suddenly assaulted by monsters. Those who save him from the monsters are Enma-kun, the son of Enma, Yukiko, a snow woman, and Kapaeru. They are members of Monster Patrol that are sent to the human world to arrest monsters.