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'd rather submit to a padlock 
on the door than to this!
!أفضّل الرضخ ووضع الأقفال على الباب بدل هذا
¡Prefiero rendirme a colocar un candado!
Prefiro colocar cadeado na porta a isso!