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...
That is the best way to 
pull wool over their eyes.
هذه هي الطريقة المثلى للتحايل عليهم
Es la mejor manera de engañarlos.
É o jeito mais fácil de
 eles não repararem.