Magical Girls are seen as a symbol of hope, traveling the world to defeat the invasion of monsters. However, there is one spot in the world where no monsters spawn. The grand city of Penubela, or just Penubela City. However, that city is currently under heavy watch by the government of the continent that rules it. After all, there is just one weird thing about the city, and that is that for an unknown reason, the city is stuck in the age of the 1920s.

However, there's much more to it than that. The city, just like others, have girls who awaken as Magical Girls, only they don't have any monsters to fight, crime is rampant, and...

....well, one can see what might happen now that Magical Girls are involved.