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...
while blindfolded and avoiding 
the knives by instinct alone.
بينما تتفادى السكاكين عبر غريزتك معصوب العينين
con los ojos vendados 
y evitando los kunai.
de olhos vendados e desviando
 das facas por instinto.