Morihito Otogi, a high school student descended from an ogre tribe, is enjoying a peaceful, ordinary life until his childhood friend Nico moves in with him. Nico is a witch trainee and chooses Morihito as his familiar. While Nico is excited to reunite with his old friend and lover, Morihito is tasked with a dangerous mission to protect her from an impending disaster. Between the unpredictable chaos caused by Nico’s magic and the awkwardness of living together, their lives become a whirlwind of supernatural intrigue and threat.