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...
I'm trying to keep any and all 
perversion hidden here!
!أنا أحاول تخبئة المفاضح هنا
¡Quiero ocultar cualquier 
rastro de depravación!
Quero manter toda e qualquer
 perversão escondida daqui!