Many Japanese guys are building Nostr clients.
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nostr:naddr1qvzqqqr4gupzq6c2vr8l8m9952e9qhxt8acn8kzzypzuhm6q70fvvxylkzu49e75qyt8wumn8ghj7un9d3shjtnyd968gmewwp6kytcqydkkzar0d4jhgu3dxqc5k5ek2afrys33x9yrj32tg5u4y5zytfdyw5je2vyvk8ag