Nico Wakatsuki has completed her six years of witch training and is returning to town alone. As a newly minted witch, she must select a familiar to accompany her. However, unlike other witches, she intends to choose a non-animal familiar. There is no better companion than Morihito "Moi" Otogi—her childhood friend who happens to be an ogre. Morihito is strongly opposed to becoming her servant, but he reluctantly accepts his fate after learning that a curse would transform him into a strange cow-tiger hybrid if he disobeys a witch's order. Because Morihito's father has left for a business trip and Nico's mother remains in the Witches' Holy Land, the two teenagers find themselves living together under the same roof. While Nico is thrilled to live with her crush, Morihito discovers that her magical antics and general clumsiness create more problems than solutions. With a disaster prophesied to befall Nico within the year, Morihito must do everything he can to protect her as her bodyguard while also fulfilling his duties as her familiar.