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...
I just had some empty space on my 
shelf, so I bought them to fill it!
!كنت أستعملهم لتغطية الثقب في رفّ الكتب وحسب
¡Solo compré revistas al azar para 
llenar los espacios del estante!
Eu só comprei coisas a mais 
para preencher a prateleira!