You just live his life. His father died – I think his father was named Shenmue, but I forget. He was karate master who got killed by another master. The starts as a young boy and you gotta help him get revenge. In the meantime, you gotta go to work, get into bar fights, and look for clues for who killed your father. You’d have to feed him or he’d get weak.
It reminded me of Tomagotchi a little bit. I never beat it though. The first and second were crazy, just like a movie.