I'll Make a Habit of it - Season 1 Episode 13 Ah, My Former Youth
8.0048 minutes
A malicious group of men intend to bring back the Edo government, which existed in place of Tokyo in the past. They find an Edo document, titled "まいぞうきん", which would be translated "buried treasure". It leads directly under Seiun Academy - and they mobilize to hold up the entire school while they dig.