Here's why:
* Supernatural Element: The core plot revolves around Charlie's ability to see and interact with his deceased brother, Sam. This supernatural element is not grounded in reality and defies scientific explanation.
* Emotional Core: While the book deals with themes of grief, loss, and redemption, the focus on the supernatural relationship between Charlie and Sam is what drives the narrative. This makes the story more fantastical than realistic.
* Narrative Style: The writing style and plot structure, with the focus on the fantastical elements, further solidify the book's position in the fantasy genre.
While the book explores real emotions and experiences, the inclusion of the supernatural element makes it more about the fantastical and the emotional journey it provides, rather than a realistic portrayal of life.