Gin-san takes history lessons, and teaches you how to hide your porn mags?
Tsukuyo tries to teach Seita history, the subject he's not great at. However, her training (?) methods end up leaving him scarred, which makes desperate Seita ask Gin-san to take over as his tutor...
So it's not like I, uh, had anything 
dirty in mind for th-these.
لهذا، أنا، لم أكن أفكّر بأي أمر مريب عند اصطحابي لهذه
No es que haya pensado
 hacer algo sucio con ellas...
Então não estava pensando
 em besteiras com isso.