Yuna and Nina decide to hold a competition to win the heart of their brother-in-law Yuuji. Who can run the best cafe and seduce him to their side? The twins compete in a school festival cosplay cafe event, dressing as angel and demon, using their charms and massive tits to tempt Yuuji during shifts with teasing, paizuri, and secret sex breaks until he can't resist and gives them creampies in hidden spots, ending with the twins sharing him in a threesome while Mira watches approvingly