Don't worry, I have met many Chinese there myself, they were all well, alive and funny.
I figured them by their greater curiosity and contact will (hehe, almost like in China itself, you just can't run away. . .), and on other occasions by their language, which I also speak. To the surprise of the Japanese around, always good fun!
Zai Yokohama (de?), go to Chinatown there, you'll feel right at home and get all the informations he pengyoumen, you need. You know your kind, hao bu hao? ;-)