One day, ordinary junior high school student Shirahime Kanata is compelled by his mother, Konata, to sign a contract that transforms him into a "magic girl" during times of trouble. As a magical girl herself, Konata wishes to pass her duties on to her son so he can maintain peace while she takes a vacation. Unfortunately for Kanata, canceling the contract would result in him permanently changing into a girl, leaving him stuck with this embarrassing task. With the assistance of his supervisor, a perverted cat named Moel, Kanata battles the "Noise," magical enemies attempting to disrupt the peace... all while wearing a cute skirt!