As his classmates celebrate their middle school graduation, troubled Mirai is mired in darkness. But his battle is just beginning when he receives some salvation from above in the form of an angel. Now Mirai is pitted against 12 other chosen humans in a battle in which the winner becomes the next god of the world. Mirai has an angel in his corner, but he may need to become a devil to survive.

Mirai and Metropoliman face off against each other for the first time in the skies of Tokyo. But with his vow to never kill, how can Mirai hope to compete against such a ruthless opponent? And can Saki overcome her demons and become a valuable member of the team?