You're Sensei, a teacher-slash-advisor in Kivotos, a city where students have weapons and councils have actual armies and settle disputes with military tactics, but they still spend their daily lives like it's nothing.
Each school is basically its own nation, and you're somehow responsible for supporting the students while they navigate both homework and actual warfare.
Think normal school anime, but every club has a military budget and your biggest challenge is explaining why tanks aren't appropriate for the school festival.