Well, 'Hell Girl True Story' is centered around the existence of Hell Girl. She's like a dark avenger. Victims with grudges visit a mysterious website, and if they pull the string on the straw doll provided, the person they resent will be dragged to hell. It shows the dark side of human nature, how hatred can drive people to extreme measures.
The 'Hell Girl Real Story' is not actually real. It's a work of fiction. The anime is full of elements like supernatural revenge and the concept of a hell - related service. These are all things created for the purpose of entertainment and to explore themes like human nature, revenge, and the consequences of actions in a fictional context.
The following novels were recommended for Hell Maiden: Hell Maiden in the Other World, I Have Hell, You Can't afford to offend me, Hell Puppet Master in Conan World, Hell Maiden Queen Elizabeth, Hell Maiden (Full Service), etc. These novels covered different plots and styles of Hell Maiden, and could be read according to personal preferences.
Hell House isn't based on real events. It's more of a fictional construct designed to capture people's attention and stimulate their imaginations. Sometimes, fictional stories like this can seem realistic, but they're not true.