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...
We just need to make it so they won't 
recognize porn mags even if they do find them.
ما علينا تنفيذه هو إعاقة تعرّفهم على المجلّات الفاضحة في حالة عثورهم عليها
tendremos que hacer que no reconozcan 
las revistas porno aunque las vean.
Só temos que fazer com que não reconheçam
 as revistas, mesmo que encontrem.