In the underworld exists someone called 27. A professional hacker, thief, assassin, information dealer that all the Mafia Famiglias have a hard time tracking. But nevertheless they can send him a job request. But what they don't know is that 27 is nothing more than a little boy, a 14 year old kid that everyone calls Dame. The clumsy, stupid, mute, useless twin of Sawada Kakeru.