The Demon Girl Next Door

Awakening her dormant abilities as a demon one day, Yoshida Yuko aka Shadow Mistress Yuko, is entrusted with the mission to defeat the Light clan's priestess, a magical girl, by her ancestor Lilith. Yuko meets magical girl Chiyoda Momo through her classmate Sata Anri, and challenges her to a duel, but loses quickly due to her lack of strength.