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...
The curtain was just raised 
on the warring states era!
!رُفع الستار عن حقبة الولايات المتنازعة للتو
A cortina se abriu para
 a era da guerra civil!