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It's difficult for me to come to a 100% definitive conclusion on whether the harassment Pika got was the reason she graduated.
I'm leaning much more towards the answer is yes.
>she said at the beginning of the year that she was excited to return to streaming throughout the year
>the sudden announcement was after 3 weeks of radio silence following the harassment
>she started liking numerous tweets that were giving a big "fuck you" to the people who harassed and bullied her
>the merch collab was announced 4 days AFTER she announced her hogwarts stream
>kson talking about pikamee's graduation and that people (vtubers specifically) shouldn't be targeted
Though there is what Pomu said about Pikamee telling her in private before her break that she planned to graduate, and what GYARI has said about the graduation being planned long ago, my feeling is it's PR to try and lessen the flames given all the circumstantial evidence, plus some of it feels pretty vague and can be interpreted in different ways.