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 went through a Video Girl 
phase and stuff myself.
مررتُ بمرحلة فيديو غيرل شخصياً
En lo personal, pasé por la fase Video Girl.
Eu também passei pela fase 
de Video Girl e essas coisas.