Morihito Otogi, a high school student who comes from an ogre family, enjoys a peaceful, ordinary life until his childhood friend Nico moves in with him. Nico is studying to be a witch and chooses Morihito as his familiar. While Nico is excited to reunite with his old friend and fall in love, Morihito is tasked with a dangerous mission to protect him from a prophesied calamity. Between the unpredictable chaos caused by Nico's magic and the awkwardness of sharing a home, their lives become a whirlwind of supernatural excitement and danger.