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...
For example, something like this...
...على سبيل المثال، شيئاً من هذا القبيل
Por ejemplo, algo así...
Por exemplo, uma coisa assim...