I think it's just one of the standard JP voice synthesisers available. I know I've heard almost exactly the same one on other Youtube videos using text-to-speech for Japanese.

IIRC it's a popular TTS character called ずんだもん.

Japan likes their cutesy little-girl voices.

That is an anime voice.

For me it showed 400 fps in the top left corner and my laptop fans spun up immediately as well. Seems to render frames continuously rather than waiting for the screen to refresh. Would probably be much less load when limited to 60 fps.

If you right click on the page, you can 'open image in new tab' and get an image of the current screen. I assume that means it is rendering an entirely new image each frame... which is a tad wild.

Works fine for me on a 17e.

Yeah I loaded it up and had no idea what to do.

Tokyo has very pleasant vibes. It's an amazing city. My brother lives there since 30 years and I've been many times (it's so far that when I go, I go for 3 months).

My daughter loves it and, motivated by having japanese family, she's currently trying to learn japanese.

I think she'll love that site (I'll show it to her as soon as she comes back home).

I get the same feeling. There’s a lack of polish and intentionality to it. It’s a cool idea and a nice demo, and there’s certainly a lot of buttons and features.

But it’s been laggy on my device, it’s visually distracting, and the UX doesn’t seem particularly well-suited for practicing Japanese.