Yuko Yoshida is just an ordinary schoolgirl — until one day the demon Lilith unleashes her dormant, devilish powers! Yuko transforms into Shadow Mistress Yuko, a supernatural powerhouse with horns and a devil tail. Now she must defeat another mystical being named Momo Chiyoda, the shrine maiden of the Light Clan who just so happens to go to Yuko’s school! But being a demonic magical girl isn’t as easy as it looks, and Yuko has a lot to learn before she’s ready to fulfill her destiny.