Yamada's First Time: B Gata H Kei Season 1 Episode 10

The Kanejou Household. The Sparkling Secret of the Noble Brother / Half Way into Love? Get Your Slut

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.