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...
Gintoki, that's what you 
were talking about, right?
غينتوكي، ألم يكن هذا ما كنت تتكلّم عنه؟
Gintoki, te referías a eso, ¿cierto?
Gintoki, é disso que 
você estava falando, né?