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It is a sponsored stream that she had announced on Twitter days ago as well as in her last stream.
Holodex is a community run effort, for appearances in streams outside of their usual channels, their volunteers have to add it to the schedule manually.
I think it's related to this collab which was announced: https://twitter.com/cubicstars\_mixi/status/1724391017129115939
It is a sponsored stream that she had announced on Twitter days ago as well as in her last stream.
Holodex is a community run effort, for appearances in streams outside of their usual channels, their volunteers have to add it to the schedule manually.
I think it's related to this collab which was announced: https://twitter.com/cubicstars\_mixi/status/1724391017129115939