Say each new item's Japanese name into your mic in 10 seconds, or lose it forever.
Minecraft, but you have to speak Japanese to keep your stuff.
Every time you pick up or craft something new, its Japanese name pops up with the romaji under it. You get 10 seconds to say it into your mic, and it has to be 100% right. Get it and the item is yours (and shows in Japanese from then on). Miss it and it's deleted. If it was something you crafted, you get the materials back.
Mobs too. Look at a mob you haven't learned and you have to say its name before you can hurt it. Zombies and creepers don't wait, so be quick.
After every try a voice says the word so you can hear how it's supposed to sound, and the quiz shows which parts you got right (green) and wrong (red).
Mic: plug it in before you start, and in Windows go to Settings > Privacy & security > Microphone and turn on "Let desktop apps access your microphone". In game, /speakitem mic lists your mics and /speakitem mic <number> picks one.
Commands
/speakitem romanji off / on hides or shows the romaji/speakitem say says the name of what you're holding/speakitem voice off / on turns the voice off or on/speakitem checks your micSingle player. Speech recognition runs offline, nothing you say leaves your PC.
Credits: Vosk speech recognition (Apache-2.0), Kuromoji (Apache-2.0), voice: HTS Voice "Mei" by Nagoya Institute of Technology (CC BY 3.0) via Open JTalk, Fabric API.