Mezuki is a former firestarter for the Lord of the Underworld. After accidentally burning down the Lord's palace, she is reassigned to Earth to keep tabs on humanity's sinning. She takes an interest in a particularly evil-looking man...

The last student living in a run-down dormitory decides to leave when the conditions get too harsh. The only thing stopping him is a zashiki warashi, who is afraid for her and her building's future once he leaves.