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...
D-Dates alone are not enough 
to learn about history.
التـ... التواريخ وحدها لا تكفي لتعلّم التاريخ
Las fechas no bastan 
para aprender historia.
S-Só datas não bastam 
para aprender história.