The key elements in Susanna Kaysen's true story include her diagnosis and the process of coming to terms with it. Also, the atmosphere in the mental institution. It was a place full of different personalities and emotions. And her interactions with the psychiatrists and nurses there. Their treatment methods and attitudes towards patients were important parts of her story as well. Her journey of trying to find herself and regain some sense of normalcy within that setting is also a crucial element.
Susanna Kaysen's true story is often associated with her experience in a mental institution, which was documented in her memoir 'Girl, Interrupted'. She was institutionalized in the 1960s. Her story shows the complex world inside a mental health facility, the relationships between patients, and her own journey of self - discovery and dealing with mental illness.
The Jujutsu Kaisen manga is indeed ending. It's been a great run, but all good things must come to an end. The final chapters are bringing closure to the characters and story arcs.