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...
The guilt of toppling your dominoes
ذنب تحطيمها لسلسلة الدومينو خاصّتك
La culpa de tirar tus dominós 
haría que olvidase buscar las revistas.
A culpa de ter derrubado os dominós