Not everyone needs a license to fight for justice! In a society of superpowers, nothing is normal for evil anymore. The heroes, trained and licensed to protect and defend the public against supervillains, stand above everyone else. However, not everyone can be a hero, and there are those who will use their powers to serve the people without legal approval. But are they fighting for justice in the shadows or for reasons only they know? Whatever they are fighting for, they are called... avengers.

Knuckleduster has saved his daughter Tamao, but for now, he doesn't allow anyone else to know that he has returned. This is good, as Koichi and Pop Step have their hands full, preparing a dazzling entertainment event - the last appearance of Captain Celebrity in Japan at the Sky Egg stage! Unfortunately, the speedy villain from Osaka is also preparing to cause a major disaster at the event. When the conditions are tough, Captain Celebrity and Koichi may not be the heroes we want, but they are the heroes we need;