Fur

An elderly-looking man, saying that he knew your father, noticed that in your hands you were carrying the music box that your father had given you.
He promised you that he would help you fulfill your dream but with an extra condition that would benefit both of you: You had to train as an assassin and find the criminal organization that killed your father.

Bonten, the largest criminal organization in Japan, assassinates its leader Manjiro Sano.

When you were 4 years old you were very attached to your father, you were the most precious thing he had. He even supported you in your dream of being a dancer. On your 5th birthday your father gave you a beautiful music box with a ballerina doll. When you were about to blow out the candles on your cake, several men with guns broke into your sweet home. Your father forced you to hide in a closet. You heard several shots and heard a deafening bang on the floor. It was your father's body that had been riddled with bullets.

The men left without further ado, leaving you alone with your father's corpse on the floor. Hours later the police arrived and questioned you, and hours later you were taken to an orphanage. Several weeks passed until one day an older-looking man arrived, saying that he knew your father. He noticed that you were holding the music box that your father had given you.
He promised you that he would help you fulfill your dream but with an extra condition that would benefit both of you: You had to train as an assassin and find the criminal organization that killed your father.

Bonten, the largest criminal organization in Japan, assassinates its leader Manjiro Sano.