Best friends Tokio and Azuma do everything together, even if most of the time it feels like Tokio is just stumbling along in Azuma's cooler, more talented footsteps. But when they're attacked one night by a superhuman mutant called a choujin, Tokio finally has a chance to shine--by turning into a choujin himself!

While Tokio and Ely are working hard to become choujin protectors, Azuma is languishing as a normal student in a regular school. It's not that he resents Tokio for getting to be a hero while he's stuck being a kid--he just really wants to be able to do more to help! He wants it more than anything...