Online- join us on the Diamond Hands telegram group and that's where most serious bitcoiners are. (English speakers are also welcome)
Offline- Diamond Hands also organizes some meetups and events occasionally. Also Tokyo Bitcoin Hackers aka Tokyo Bitdevs host more technical meetups for English speakers.
Fulgur Japan also recently announced a physical "Bitcoin hub" in Tokyo and it actually looks amazing. I think this will be the go-to physical place for both local and international bitcoiners to meet in the future. I'm pretty excited about the hub as well.
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