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...
like Taka-chin's parents, who focus on the 
naughty bits and get the wrong idea, right?
سيأخذون الأمور الفاضحة وحدها في الاعتبار ويكوّنون الانطباع الخاطئ مثل والديّ تاكا-تشين
como los padres de Taka-chin que solo se 
fijan en las partes subidas de tono, ¿no?
como os pais do Takachin, que só veem
 as coisas vulgares e se enganam, né?