After four years since their disappearance, The Powerpuff girls Z realize that their new classmates are nothing more, nothing less than the Rowdyruff boys Z! Nevertheless, they're not what they expected. The boys don't seem to remember them and act like normal boys! What's behind this mystery? Are the boys just playing fool and planning to do something bad? And if they're telling the truth, what happened to them?

when the girls turn 5 years old all the monster and demon disappeared even jojo and the Rowdyruff boys there was nothing left for them to do anymore so they decided to try and live a normal life but even if the girls decide to do that there power were still on growing and new power appears and when they reach high-school the rowdyruff boys return will this also bring back the monsters or did the rowdyruff boys take a new turn.

The PowerPuff Girls were the undefeated heroes of the City of Townsville, the sisters had many foes and challenges that they faced together- though they were very young when they started fighting crime. And then the heroes disappeared. And the villains were free to do as they pleased. Though the RowdyRuff Boys never did find out what had happened to their greatest rivals...