As his classmates celebrates their middle school graduation, one student's mind seems to be elsewhere. His name is Mirai and he has a dark secret. All humans deserve to find happiness, but Mirai may need some salvation from above in the form of an angel.

The battlefield is set! Mirai, Saki, Mukaido and the recently converted Hajime vs. Metropoliman and his bizarre allies. Mirai's team strikes first and eliminates one of their opponents, but the battle is far from over...