The Spirit Plane is at constant war with itself and the humans are about to be dragged into it.

Fortunately, one worthy human is given the ability to guard the Seal that would accelerate unimaginable chaos, but in order to do so they must leave behind all human attachments.

Kira Vermillion just moved back to Tokyo with her step family and a series of unfortunate events have led her to taking up the position of the mysterious, urban legend Vigilante the people of Tokyo have dubbed Demona.

Despite the odds and unwilling to give up her normal life for anything, she's faced with two options, await discovery and death or embrace the change and fight.

Armed with new, dangerous abilities, powerful allies, and pesky Demons in her head, Kira must train to become stronger so she can stand up to the evil forces that threaten the city, her family and the sense normality she wants to regain once and for all.