What makes a magical girl special?

Sakura Kagami is just an ordinary girl, and her magical-girl persona, Prism Cherry, is just as ordinary, too. After the same old tired routine of saving people with her boring magic in a peaceful town, Sakura learns that her classmate, Nami, is also a magical girl. The two of them become fast friends, but it doesn't take long before the veneer of magical-girl-hood falls apart to reveal something more sinister than they'd ever anticipated.

(Source: Yen Press)