As the school festival approaches, Yuuji finds himself as the tie-breaking vote between opening a Demon Café or an Angel Café. However, the festive preparations are overshadowed by his escalating intimate relationship with Mira. After a series of secret encounters and a heartfelt confession of love, Yuuji and Mira decide to move past their familial roles, only for Nina and Yuna to discover them and demand to join in.