Once again, we are in a futuristic Tokyo. The possession of weapons has been liberalized and urban delinquency dramatically increased. The police, indicated by the acronym RAPT, believes now that criminals are helpless scum, and prefers to eliminate them inmediately then arrest them. In this scenario we are introduced to Kyohei Tachibana, a young boy who dreams of becoming a pastry chef and studying in France. To meet this ambition he decides to find a part time job, until he is contacted by four girls: Jo, Meg, Amy and Sei. These four girls are nothing but the mercenary, which will eventually involve the poor boy in their crazy missions.