Natsumi, Ayane, and Haruna are couriers at a delivery company called Rapid Angel — fast, professional, and suited to the work. When they are assigned to deliver a set of important blueprints, the job should be routine. It is not. An organization with considerably more resources than three couriers is also after the same documents, which means the blueprints are worth more than the standard shipping rate implies. The girls are going to have to figure out why.