Jill the candy making witch summoned a cute little ghost cat named Mumu to help her with her candy making duties.

One day, Jill decided to make soup and Mumu agreed to help. All was going well until Jill decided Mumu's heart would be a part of the recipe! Scared for his life, Mumu barges out of the house and escapes, but Jill does not intend on letting him go that easily...

During his escape, he encounters various characters and slowly uncovers the truth that ties everyone together.