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...
What, did the teacher abandon class halfway 
through and go, "Let's play dodgeball today"?
ماذا، هل أوقف المعلّم الدرس في منتصفه قائلاً "هيّا لنلعب كرة المراوغة اليوم"؟
¿Qué pasó? ¿La profesora dejó la clase 
a la mitad y dijo "Juguemos a los quemados"?
Como? O professor abandonou a 
turma e resolveu jogar queimada?