Being an art student at the time, juggling part-time jobs as an assistent in a friend's father's photo studio, ramen delivery, and a record store (vinyl not CDs), it was actually quite easy fall into a job doing menial tasks at Hudson (actually quite a few of the students either worked in the videogame industry or for animation studios). Eventually you moved from digitization, to cleanup, to sprite monkey. Then somebody figures out that since you used to mess around on a C64 (not very common in Japan), an MSX, as well as Amiga (imported from US) and Sharp X68K (a friend's drool worthy machine) that you know you're way around a 6502, and it's close enough to a HuC6280A that you can be tossed various little bugs that the programmers don't have time for or want to deal with (sometimes it pays to chat about bugs with programmers over late night meals at oden carts).
Then you get lucky. 3D shit takes off like crazy both in the arcades and home consoles, and suddenly those hours with offline rendering tools in school put you at an advantage. Now there's even more demand for artists, and since you're familiar with CG tools as well as optimizing artwork for console games, you started becoming a valuable resource. Plus NEC all this time has been doing cool shit like releasing homebrew kits for the PC Engine and PC FX, so meanwhile you've been making you're own little console demos (the PC FX was rather cool since it'd do double duty as a SCSI CD-ROM drive as well). Then Sony does the same thing with Net Yaroze. While during all this time, hang out with folks from other studios (usually checking some shit in Akiba (back before it became a hip tourist area)), so you tend to make if a few connections with folks from other studios (this is a lot harder for folks in Japanese studios, since there's nothing like GDC, and Japanese studios tend to hold their eggs close to the nest).
Then school is over, and suddenly it's time for you to either go home, or convince somebody to give you job (or convince some lady to marry you so you can stay (unfortunately the GF isn't willing to go that far
)). BTW, the work you've been doing is technically shady anyways since you're not supposed to be "working" on a student visa, so that makes it hard to use your "jobs" as references as well. But you get lucky, and some folks from a large geometrically named studio happen to like your silly little Yaroze demo. More importantly, one of the silly blokes you've been geeking out with in Akiba happens to work for said studio, so you're lucky to have a personal connection (worth their weight in gold in Japan), happens to put in a good word for you.. I think that just about sums it up.