They definitely exist but you have to know the right people like how it is in the US. Networking is important in this business, as you may know. Still, it's harder in Japan because of all their business and social structure.
Straight out, "most" Japanese traders from Japan are major A$$holes. There are a$$holes in every business but most of them in Japan are conceited B@stards. I hate them next to churn brokers, regardless of my Ethnic Background. They treated me like a twinky gay secretary when they first meet me and once they find I'm a trader and fairly profitable, they start kissing your ass. Geez I hate them.
I've been offered to go back to Japan, a while back and help them with a prop. firm in Tokyo as a trader/instructor. I'm a Gann analysis based discretionary system trader and performing well also at the time. Friend of mine was asked if they knew any traders and he just gave my name out. You don't see a lot Gann traders (I still haven't met one in person yet) and also a programmer. They found me interesting and but I just refused the offer.
It's a nice place to visit but I don't want to work in that Socialist Nation. They should really bring back the Feudal System and have them fight with swords again.
Still, I'll ask one of my friends who came up with the offer and see if he still knows anything about it. If I do, I'll PM or post something about Japanese Prop.