Shinsetsu Mahou Shoujo

One day monsters appear in Kakyou City. The school Chiyoko and Haruka are in shakes like during an earthquake and the window panes shatter all at once. During the commotion, the two rush to the rooftop. They see bodies lying in the street and smoke in the distance.

A strange talking cat approaches them and asks them to become 'warriors' in order to fight against 'Biomonsters'. Panicked, Chiyoko is first to agree. She receives a round gemstone-looking transformation device along with a rather painful needle in the back. She suddenly finds herself able to travel faster than the speed of sound. Together with Haruka they are barely able to fend off the Biomonsters.