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...
If you don't want your porn mags discovered,
إن كنت تريد تجنّب الكشف عن مجلّاتك الفاضحة
Si no quieres que descubran tus revistas,
Se não quiser que achem seu pornô,