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 import of guns in 1543 was simply 
a fake-out to conceal the truth.
كان استيراد الأسلحة عام 1543 مجرّد حيلة لإخفاء الحقيقة
La importación de armas de fuego de 1543 
fue una mentira para ocultar la verdad.
A importação de armas de 1543 foi só 
uma fachada para esconder a verdade.