>>3432534Someone put together a fairly detailed list of theories here:
https://www.vtuber-housou.com/hatobatsugu/It's all in Japanese, my Japanese isn't too great but I'll try and sum it up.
Giant, multi-post wall of text incoming.
1. She's been kidnapped/being observed.
The thinking behind this theory is that some of the videos are taken in a peeping tom kinda style, and in others she's formally addressing the camera, or the "abductor" in kind of a stiff, weird way. Article mentions these two videos specifically:
https://www.youtube.com/watch?v=5T9AFFPSS9shttps://www.youtube.com/watch?v=7W2XwtrlmqoFor that first video there are some sounds in the background made by someone else that she doesn't react to, when she's eating. Another point is that when she's brushing her teeth, the view of her in the mirror isn't reflected, the towel in the background is missing, and the handle on the container in the background is in the wrong place, which the article points out as being proof that maybe she's being watched through a false mirror. That video was introduced on twitter as being homework (for who?).
In the second video, apart from the start she seems like she doesn't know she's being filmed until right at the end where she grabs the camera and it shuts off, and the camera itself looks to be hidden behind something. She also has a bandage on here ear where it looks like an earring was ripped out by someone. (Or just put in). At the start she's wearing different clothes. Maybe that's where everything began?
The article mentions that she doesn't seem scared, so maybe her abductor is someone in her family, someone she knows, or has managed to brainwash her. It's all unclear.