Shiori wasn't a character from an anime, but a character from the literary work " One Hundred Years of Solitude." She was a character in a novel by Colombia Márquez, described as a charming woman with a complicated life. In the novel, Shiori was one of the representatives of Márquez's description of the history and culture of Latino America.
Definitely not. Unhinged (2020) is a made-up story. The plot and characters were crafted by the filmmakers to thrill and engage the audience rather than being drawn from real-life events.
It depends on your definition of a 'real story'. 'Unhinged' might incorporate elements from real life, but it's likely a blend of fact and fiction to create an engaging narrative.