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>worst case
Nothing happens, she posts a picture of some fan art showing her with a birthday cake and that's kinda it
>medium case
She does a birthday stream with some karaoke and thanks people and tells them she's been very busy with project stuff but will be back soon
>best case
Gura announces Seven Days of Shark to celebrate her grand return, leading up to her birthday party. This week includes a big karaoke, a nice totsu, a zatsu, a draw stream, a game stream and an ASMR for members and culminates in a massive live concert on her birthday with numerous high caliber guests.
She has a new anime intro to show off, performs TWO new orisongs (the delayed one and a third, new one) as well as great merch and teases an upcoming multi-episode full-length anime which she fully voiced. She returns back proper and everything is the same again as it used to be with her streaming ~4 times a week and everyone having fun and a good time.