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For anyone confused like me, looking at this on the artist’s Pixiv shows that the Star Sapphire-looking character is Kaguya’s VTuber rig thingy. Kaguya’s the one who said insulting things on stream, it is not her being angry at people forgiving Star Sapphire for that.
EDIT: Failed to realize this was posted 16 days ago, leaving this here for anyone coming across it browsing.