>>22208048Miori has put in a ridiculous amount of work to get her numbers up because her parents are trying to force her into medical school and basically gave her an ultimatum. If she can prove that it's a viable career for her within the next year then they might ease off, if she can't then she'll probably be forced to soft graduate.
Char and Purin both fell off because they basically stopped streaming for extended periods. Nobody really knows why Char streams so rarely, but in Purin's case it was because of circumstances that were completely outside of her control (she's back to streaming regularly now though).