"Can you fly?
Can I fly?
How do you fly?"

Kakeru is an ordinary high school student. One day, he was going to school as usual, but as he got there he saw lots of toy soldiers storming the building. He is lead to a classroom with some other students, still baffled at what was going on.

Suddenly, a schoolgirl storms into the classroom and says "Sorry, we've occupied your school. If you don't want to die, please fly in one month."

Everyone is shocked, but take the news enthusiastically. They have a party to get acquainted, and their month starts...