Definitely is abrupt. Just yesterday was watching her casually dismantling ships in Hardspace: ShipBreaker, and occasionally floating into the furnaces by accident.
This one was pretty shocking. She was a very unique addition to NijiEN and I'm heartbroken she doesn't wanna stay. I'm definitely gonna miss everyone's crazy fox mom. On the bright side there's no drama and this is all just her decision to leave. I hope she finds something else that makes her happy either IRL or in the vtuber world.
It seemed sudden from the outside perspective, but going by some of the other livers' tweets (Kotoka said she thought she had gotten over it already, for example), it looks like something she had already decided and not some secret drama.
This was a very abrupt announcement, makes me wonder what she did, or what anycolor perceived she did.
Per the letter she has on her twitter, isn't nothing absurd. She feels like she isn't doing good enough, isn't living up to her own expectations, and was basically being extremely hard on herself to the point of making herself miserable so she wants to step away and that's perfectly valid. No real drama, no one did anything wrong, she just isn't happy.