Earlier quoted context omitted.
From HN meetups, which is most of my exposure to the Tokyo tech grapevine, I have heard good things about a gigantic multinational advertising firm and an assortment of finance companies. Tokyo's a big place and every industry you've ever heard of, and most multinationals in those industries, has some presence there.
How do I get into these HN meetups.
It looks like the founders of MakeLeaps (po and jason_tko on HN) have been organizing them roughly every two months for about a year now. I was thinking of bugging them pretty soon to see when they were thinking of having the next meetup.