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...
Jeez, I've been thinking about porn mags so 
much, I don't know what's what anymore—
ظللتُ أفكّر بأمر المجلّات الفاضحة وحسب 
!ولم أعد أدرك ما الذي يجري
He pensado tanto en las revistas 
que ya no sé qué sucede...
Credo, estou pensando tanto em
 pornô que nem sei mais o que—