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...
Oh, n-no need for that.
We were just about to begin.
كـ... كنّا على وشك مباشرة الأمر، لا تكترثي لأمرنا
N-no te preocupes, estábamos por comenzar.
Ah, não se incomode com a gente.
 Estamos prestes a começar.