In the city, there are not only people, demons and ghosts, but also some mysterious things that wander in the gray area...
The heirs of the Li family who are bent on honoring their ancestors, a fish demon who guards the demon gate, a fire elf from a mysterious space, and an expert in catching ghosts. The chaos they cause is enough to destroy the earth, but their common goal is: to protect the human world. Alas, what a headache~~