Natsuki loves martial arts and is a young student of her high school's karate club. A new transfer student has just arrived at her school: the aloof and expressionless Rina. Nevertheless, Natsuki is interested in befriending the girl and forces her way into walking home with Rina. Yet on the way, trouble strikes in the form of masked attackers! With Rina's wrestling expertise and Natsuki's karate moves, they are able to fend off the pursuers easily; however, the bigger concern is why are Natsuki and Rina being targeted?