A teenage male named Simon has to fill up his father's spot as a mafia leader due to his father's death. Sadly, he doesn't seem to manage his family life with his mom and siblings since he focuses on his task as mafia leader. Simon then was dragged out of Europe (Which is where his mafia is located at) to enjoy something different in another country... America. He experiences a lot of feelings and delusional responses with gunshots near his ears trying to forget what he has seen before. He then meets two characters named Fallen and Ayame. They're faithful friends and all but something may go between the three of them.