14-year-old Anko comes to the countryside for the first time in 10 years with a friend to ask her grandmother about yokai . There, she hears the story of "Warashi-sama" from her grandmother. At first, Anko didn't believe in yokai, but when she went to see the dragon stone at Ryujindo, she met a yokai and was saved by Warashi when she was attacked . Anko, who learned about the existence of her yokai after this incident, solves the yokai-related cases with Warashi.

Warashi, accompanied by Amanojaku, who reveals his true form , falls into Mugen Jigoku through Nozuchi's mouth, restoring peace to Tokyo.