Kaito's wife Ayame hides a secret: a magical talisman on her forehead seals a portal to the Succubi Realm. When it slips, flirtatious succubi like Liliana and Sariel spill into their home, causing chaotic, comedic havoc. Kaito must juggle his tsundere wife's temper, a growing harem of supernatural troublemakers, and his father-in-law's strict guidance to prevent a full-scale invasion, all while trying to stabilize their marriage. The crisis forges a new, chaotic family, with the succubi becoming permanent, if disruptive, housemates in their uniquely loving home.