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.
The only thing that connects to me
to the other half of my father.
ein Hinweis auf die mir unbekannte
Vergangenheit meines Vaters.
le seul indice
pour savoir qui était mon père.
è l'unico indizio che ho per conoscere mio padre.
Uma pista para saber coisas 
que não sei sobre meu pai.
нить к истине о неизвестном мне отце.