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...
Besides, this method only lets me 
hide porn mags on her birthday!
كما أنّ هذه الطريقة تسمح لي بإخفاء المجلّات 
!يوم عيد ميلادها وحسب
¡Además, solo podría 
hacerlo en su cumpleaños!
Além disso, com esse método, só 
consigo esconder no aniversário dela!