Hazuki Family's maid Ine hands a letter to Ryo, who is restless from his Father's death. The letter was sent from a person named "Yuanda Zhu" to his father which contained characters he cannot read. Ryo begins investigating the letter to find out his Father's past. As he further investigates, he is targeted by "Mad Angels", the gang that runs Yokosuka Harbor's underground business.
But I know that my father wasn't a killer.
And I'm going to prove it.
.لكني أعرف أنّ والدي ليس قاتلا وسأثبت ذلك
Aber ich glaube einfach nicht,
dass mein Vater ein Mörder war.
Pero sé que mi padre no fue un asesino.
Pero sé que mi padre no era un asesino.
Moi, je ne crois pas
que mon père était un meurtrier.
Ma io so che mio padre non è un assassino.
Mas não acredito que meu pai seja um 
assassino e vou provar que ele é inocente.
Но я не верю,