With the demon realm's dispute settled, Basara Toujou's household slips back into routine. Mio Naruse and the succubus Maria Naruse remain bound to him by the master-servant pact, Yuki and Kurumi keep watch, and a day at the waterpark goes about as expected. Then a message from the Hero Clan arrives, summoning Basara and Mio to answer for what they did in the demon realm. This hour-long OVA follows the television series and adapts a later light novel volume.