I found this small VTuber who is graduating. I tried searching for it and I don't think anybody posted about her graduation (or really anything about her).
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The Graduation notice is the typical "not goodbye, but see you later" affair which probably means she's joining some corpo.
What's interesting is that she is releasing a cover of a Niji ENcounter song as part of her last week before graduation. Together with Mr. Underhill (Niji-loyal dramatuber), that's two recent graduations where Nijisanji is the most obvious place for them to go.
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Archive)