First time I bumped into Japanese computer illustrators (not counting in the usual animes I grew up watching) was actually in Paris. The book MondoFragile Part I has a collection of great up and coming lifestyle illustrators around the world. They have a website displaying some of the collections online, and under each artist there is a link (if they have a website) to their homepage where more work are posted.
MondoFragile Part II came out already. You can buy these books online:
It’s an eye-opener. I have put up a few that I absolutely love here on the space. Under July photo album are the few on display.
Enjoy.