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...
Man, thinking about all 
that crap wore me out.
أصابني كلّ هذا التفكير العقيم بالإرهاق
Rayos, tanto pensar me dejó exhausto.
Cara, cansei de pensar em besteira.