There is also a pretty comprehensive list of co-working spaces (all in Japanese though) here: https://www.makeleaps.jp/%E9%83%BD%E5%86%85%E3%81%99%E3%81%B...

Also if you're in Tokyo, don't forget to check out the Hacker News Tokyo community meetup events.

The next one is on the 13th of May. Hope to see you there !

https://hntokyo.doorkeeper.jp/events/24116