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...
A Mirror Provides a Frozen Reflection 
of Both Your Beautiful and Ugly Sides
 تعكس المرآة الجمال والقبح كما هما
Los espejos reflejan tanto 
tus lados buenos como los malos
Espelhos Refletem a Parte Bonita e Também a Feia