An extended fictional narrative which is realistic is known as a

An extended fictional narrative which is realistic is known as a novel.
A novel is a long work of fiction that tells a story in great detail and depth. It typically has a complex plot, well-developed characters, and explores various themes and ideas. Unlike a short story, which is shorter and focuses on a single event or theme, a novel provides a more extensive exploration of its subject matter.
While diaries can also convey narratives, they are typically personal accounts of a person's experiences and do not follow a traditional story structure. On the other hand, a novella is a shorter work of fiction that is longer than a short story but shorter than a novel. Novellas often explore a single theme or idea in depth. However, for an extended fictional narrative with a realistic setting and a detailed exploration of characters and themes, a novel is the most suitable option.