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Graduating before means that you may or may not meet your oshi anymore but vtubers nowadays graduate simply because they're bored, want to get away from their corpo life, or just because they're tired of their current persona.
I want to feel sad about Ame but she's already ready and has her next vtuber life planned that it makes all the emotion along with her graduation seem so empty. I wouldn't be surprised if she reincarnates the same day as she graduates.