Ureshiko Asaba is a 26-year-old married woman. Few people realize she is a supernatural girl named "Agnes," and she is the protector of the town where she resides. One day, she meets Sayaka Kurenai, aka "Cruje," another magical girl appointed by the magical realm as the legitimate successor to her position, but Agnes is hesitant to let her take over because she knows Cruje has orders to erase the entire place, including its human inhabitants, in order to create a new one. To make matters worse, Ureshiko must cope with the growing gap between her and her husband, Tamotsu, as well as her growing love for Tatsumi Kagura, a young man who is now living as a renter in her home.