There are many Devs on Nostr building all kinds of app - this is the repo for Nostr apps/tools from Japanese developers.
Since there's a lot, please see whenever you get the time -
https://github.com/nostr-jp/awesome-nostr-japan
ありがとう，あなたのような素晴らしい案内人に巡り会えてよかったです
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Most Nostr users are very helpful - it's a good community, especially Japanese nostr users 😊