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...
It won't help one bit when I become 
a working member of society, anyway.
لن تكون ذا نفع لي البتّة بعدما أصبح فرداً عاملاً في المجتمع
No me servirá de nada cuando 
trabaje en el mundo real.
Não ajuda em nada quando se
 começa a trabalhar, mesmo.