Haruka is trying to start a new life over with Nao, but Sora is always at the back of his mind, since, lately, she seems not to accept Nao, and that she seems to be teasing him. Haruka suggests a date with Nao, but cannot get to tell Sora about it, even disguising it as if he will be spending time with Ryouhei. During the date, though, Nao notices that Sora is never far from Haruka’s mind, him buying things for his sister rather than for her, and eventually spoiling their date. They plan to make croquette curry upon arriving home, but is canceled when Haruka finds Sora not feeling well in her room after having a bad dream. The next day Nao notices that Haruka tries to hide his date with her from Sora, but she just went along. One night, Haruka catches Sora masturbating in her room while mentioning his name, much to his dismay—she is enamored with him ever since that one summer day in their childhood when Haruka kissed Sora while playing.
悠とキスをかわした奈緒は、穹に2人のことを話したいと提案するが、悠は煮え切らない。なぜなら悠は、穹のことを異性として意識し始めていたからだ。だが悠は穹への思いを断ち切るために、奈緒と2人っきりのデートを約束する。
一方、悠と奈緒の関係に気づいた穹は、先に約束があるとウソをついて、悠が自分と奈緒のどちらを選ぶのか試そうとした。そうとは知らない悠は奈緒との迷いつつもデートを優先。
そして帰宅後、自分が置き去りにされた夢を見て泣く穹を強く抱きしめた悠は、改めて自分達がたった2人っきりの家族であることを認識するのだった。
悠再次确认了过去与奈绪两人之间的感情。但是，穹的毫无防备与专情的态度，让悠的想法产生混乱。最后他甚至目击穹一边喊着自己的名字，一边抚慰身体的场面。这也让悠拼命压抑至今的想法──对妹妹的感情开始苏醒。
Bei einem Date mit Nao merkt Haruka, dass Sora niemals aus seinem Kopf verschwinden würde. Sora setzt Haruka und Nao mit ihrer Eifersucht massiv unter Druck. Eines Nachts ertappt Haruka Sora in einem sehr intimen Moment.
