★ Since he missed almost two weeks of school, Ryouya is struggling to catch up before finals. If his grades tank, he'll be stuck in summer classes. Seeing him struggle, Riona offers to help him study, and before he knows it, the twins invite themselves over to his house. When he awkwardly asks if it's really okay for them to visit a guy's house, they just smile and say their family lets them do whatever they want.
★ When they arrive, Ryouya's little sister, Mio, is shocked to see him bringing home two gorgeous girls at once. Reona and Riona hit it off with Mio immediately, even asking her to be their "little sister" too. Plus, Ryouya's mom already knows and likes them from when they visited the hospital.
★ One morning, while Ryouya is getting ready for school, the front door just opens, and the twins walk right in. He freaks out and asks how they got a key. Turns out, his mom just gave it to them.