Yeah, the twitch channel is linked on the youtube gaming channel and it has pretty blatant clips of her.Seems to match some of the cosplays she has confirmed on stream
Thats 100% her. Though i feel i must check in with my buddy @Would
Edit:
Description for the gaming channel also has two further channels listed that weren't covered above.
https://www.youtube.com/@hitsugayahinamori/featured - korean covers
https://www.youtube.com/@xMichiChama - OLD covers
This clip with her typical speaking mannerisms:
And this clip with her typical scared reaction:
This doesn't seem like a 1 week adventure for some turbo autist. This looks less like someone leaked info and more like an unauthorized access of information, likely through a data breach. Definitely feels like someone wouldn't have been able to piece this together through public information and they had to use private information, hence they didn't show anything indicating how they got that info because they know it was gained through illegal means.
The fact that they had addresses and such would indicate that this is less of a leak and more someone getting access to a database with mailing/contact information for the company.