Spring Thunder.Nanoka has broken their promise and has come to Koshiro's apartment to see him. She has brought a bag of fruit, worried that he isn't eating well. She offers to make him a meal, but his refrigerator is empty and he goes out to pick up some things. In the meantime, Kaname drops by to retrieve the train pass she had left there, and is shocked to find Nanoka there. She tries to make Nanoka go home by telling her that she is going out with Koshiro, but Nanoka refuses, saying that her feelings for her brother are greater. She insists that Kaname leave instead. Kaname encounters Koshiro on his way home and tries to talk sense into him, but he will not listen. Kaname begins to see that they truly love each other and apologizes, that she was wrong to have accused him of one-sided obsession the day before, and that she will not interfere anymore. At this point Koshiro is sad to have lost a friend, Chidori, while Nanoka is burdened by doubt that Koshiro might be in a relationship with Chidori. After they talk, the siblings accept that they really do love each other and want to be together no matter what. They spend the night together as lovers.