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...
As if mere humans could 
ever evolve that easily.
كما لو أنّ البشر سيتطوّرون بهذه البساطة
Ni siquiera los humanos 
evolucionan tan rápido.
Até parece que meros 
humanos evoluem tão fácil.