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Looks like another Holo has been talking about Polka in members streams, this time being Peko-chan. Relevant TL from a nousagi over there.
>She realizes that in the past year, she's been getting a lot more messages from other holomem, which was different from how it was before. She continues that she isn't really the type to send messages herself so she's always happy getting messages, and gets her to think that the other party thinks of her as a friend. She also mentions the chats she has with Polka, which are pretty much run-of-the-mill talk between friends like conversations; anime talk, talk about which character they like, etc. She likes being able to have such exchanges with other holomem. She goes on to say that she's still lacking in that department; getting messages are fine and all but she still has trouble sending messages on her own accord.
Also apparently Polka got her to watch Chainsaw Man as well