Bond of Justice: Kizuna

KATE a rookie detective, happens to blunder into a hit job in progress and see assassins. She is about to be killed for cleaning any witness by one of them, Gen, but he takes pity on her and makes her swear that she will never reveal their identities. Another day, as Kate's best friend is murdered by Japanese mafia (Gondo's), Kate finds out Gen to ask her friend's revenge, but she is denied for poor compensation she brings. Gen plus other assassins accept for her wish which is also joining as a assassin in the condition with them. How will she be as an assassin and as a detective......? We find that each life is connected; like "bond of justice" which is come from friendship and loves among assassins.