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...
Well, you need to at least study 
up on your own country's history.
عليك دراسة تاريخ بلدك على الأقل
Deberías aprender la historia de tu país.
Vamos lá, você precisa ao menos 
estudar a história do próprio país.