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...
Wait, Excalibur Sigma's 
just "honey" from earlier?!
لحظة، إكسكاليبر سيغما هي العزيزة من قبل وحسب؟
¡Espera! ¡¿Excalibur Sigma
 es la mujer de antes?!
Espere, Excalibur Sigma
 é a "querida" de antes?