Tokyo - the capital of Japan.

A mysterious man named Phantom plots to regain his sealed powers.

By giving weaponry known as F.A. (Fu-mantion Artifacts) to youths with special abilities, he lures them to battle with promises to grant the wishes of the victors.

Due to the violent clashes of the F.A., a distortion was caused in space-time, creating a rift between this world and another.

This rift led to the breaking of the seal on Phantom's powers.

Waka. daughter of the Kumon Family, a clan waging war against evils such as Phantom, along with the support of Mikoto, are working to stop this plan. Phantom however, manages to escape from them just in time.

While escaping, Phantom kidnapped Waka's younger sister Nagi.

Along with Itsuki, a maid of self-proclaimed ally of justice and Yuzuha, a ninja unpersuaded by the lure of Phantom, these four women set off in pursuit of Phantom in order to rescue Nagi.