By day, Matoba Megumi is a model student in every sense, respected and admired by everyone in the community as the daughter of a wealthy family. She follows the rules and maintains her strict lifestyle. But at night, Megumi becomes the leader of the female biker gang Artemis and is known throughout the city as the rabid canine for her violent personality. At night, she doesn’t take any crap and any hostile actions towards her and her crew will lead to a beat down. But when the sun rises, Megumi has to become the ladylike daughter that everyone thinks she is.