The Kanejou Household. The Sparkling Secret of the Noble Brother / Half Way into Love? Get Your Slutty Hands off My Kosuda!!
Both Kosuda and Yamada are going for another date, nagging worries and all. Kosuda is delayed unexpectedly, causing Yamada to go jumpy and grab the nearest guy she could get. Unfortunately, the second guy she grabbed was Keiichi. He then invited Yamada over to tea as an apology for what happened at the sports meet, with Kosuda, who caught up with them, looking like a chaperon. During tea Keiichi confesses to Yamada (and the more right now because he has heard from Kosuda that they are just dating), but gets rejected. However, her refusals get replaced by some deep thinking because, contrary to what she thinks of Keiichi, he is still a virgin (because Kyouka had all of those girls who have confessed to him terminated)--and that's what Yamada is looking for! Yamada, though, thinks Keiichi is just tricking her. Overall, that, including Misato's unexpected entry, effectively ruins the date between Yamada and Kosuda. Kosuda pities himself again, while Yamada is just holding herself from choking Misato to death. Meanwhile, Kyouka is having nightmares of her beloved brother meeting up with Yamada and confessing to her for three days, only to find out that it’s true.
As Kosuda is still clueless as to Yamada's intentions (which was later dispelled after seeking advice from Miyano,), Yamada tells details of the date to Takeshita, and now she concludes that she likes Kosuda, virgin or not. Meanwhile, Kyouka tries to earn payback against Yamada by stealing her boyfriend. Kyouka goes to all lengths to know everything about Kosuda, even from Miyano (and this disappoints her Erogamisama). The next day Kyouka begins to attract Kosuda. It failed, so she invites him to her house “for a photo shoot.” Yamada sees them, and goes bananas thinking Kyouka is inviting Kosuda over to her house to have sex. Later, Yamada catches sight of Kosuda leaving in Kyouka's familiar golden stretch limousine. At her house, Kyouka, with urgings from her own Erogamisama, seduces Kosuda. However, Ichihara-san, her nanny, catches Kyouka stripping in front of a freaked-out Kosuda, so she requests that she keeps this a secret from her brother. While Kyouka is distracted, Yamada arrives, entering via the window, to get Kosuda, because "she is still on the way there"--she is about to fall in love with him. Kyouka, meanwhile, now armed with sly tactics from her nanny, finds that Kosuda is gone.