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...
She seems ready to assassinate 
me at any moment!
تبدو متأهّبة لاغتيالي في أيّ لحظة
¡Está lista para asesinarme 
en cualquier momento!
Parece pronta para me 
matar a qualquer minuto!