Kohinata Mangetsu is a regular high school student with a cheery attitude. However, one night when the full moon is out, she finds herself transported to another dimension where magic girls fight in a battle royale with mecha called Armanox. The prize? The inheritance of all the world’s magic, which was sealed away 1000 years ago. Kohinata is now in possession of her own Armanox, finds herself thrown into the fray.