There's a dueling arena in the back of the school where the student council fights over who gets to be engaged to the Chairman's sister. That's weird, but not the weirdest thing.

There's also a castle in the air over the arena where Eternity is supposed to live. All kinds of weird things appear in the arena during the duels.

And the Chairman is running it all. I don't even know why. Besides that he and his sister are seriously creepy.

[the paper is crumpled, like Nanami nearly threw it out before sending it].