This is Yamanote Eitoku Academy. A super-prestigious private school with an escalator system from kindergarten to university.

I am Guest. I don't think there's another high schooler in the world as disappointed in life as I am.

It's a Red Tag!!!!!!

That's right. In this school, there's a group of four called the F4. They post Red Tags to force poor students to drop out. Anyone with a Red Tag gets bullied by the entire student body.