Sora had become nervous around his older sister Aki, since he had started having lewd thoughts about her. While taking a bath together, Aki masturbated Sora, who runs off in disbelief. The next day, Sora can`t face Aki and runs off, inevitably getting locked in a store room. Aki eventually finds him and the two kiss, later returning home to make love. This episode incorporates Chapters 1 and 3.