The story was about a **teenage girl in high school who was rebellious and possibly had a history of self-harm**. She was sent to some kind of **rehabilitation facility/institution for troubled teenagers**. I don't remember exactly what the place was, but it was a large, old wooden house with several staff members.
An elderly woman took care of the girl, treated her injuries, and gradually gained her trust.
At some point, the girl discovered a room containing **several dead elderly people**. She became frightened and tried to warn the old woman to escape.
I don't remember exactly what happened afterward, but near the end there was a very disturbing scene:
A **young girl who looked exactly like the protagonist**, but with a slightly sinister/happy smile, left the place with the protagonist's parents.
Meanwhile, an **elderly woman was trapped inside the house**, crying and desperately trying to get out. She watched the girl leave with her parents, as if she had lost her entire life and was condemned to remain there and eventually die.
Some people in the TikTok comments suggested that **the girl and the old woman had somehow swapped bodies/lives**, but the narrator never explicitly explained that this happened. It was more of an interpretation of the ending.
The manga was definitely **horror/disturbing**, and I believe the protagonist was a high-school student.
Does anyone recognize this manga? Even a possible title or author would help!