Chapter one - a cold night

In a future where Bonten is ruled by Izana Kurokawa and his brothers Manjiro Sano and Shinichiro Sano.
There's no one being able to penetrate his icy heart until a faithful night where he gets into an accident where he hits a girl in the dead of winter night

who is she and what will this encounter lead to... and how will she deal with being dragged deep into the world of the mafia.