What is the story background of Zero Series III?

Hello, landlord. Let me simply write down the plot of each movie. Part I:1September 26th, 986. In order to find a benefactor whose whereabouts are unknown due to information reasons, the writer Gao Feng Giust went to the icehouse where Gao Feng disappeared, but he also disappeared. Zhendong's only sister, blushing, came to the igloo alone to find her brother. Part II: Sister Tamkura and Sister Amakura Mayu. Because of the reservoir construction plan, they have to move out of that place. In a few years, the sisters will return to their former hometown for sightseeing. However, he strayed into the enchantment and entered Wanshen Village. Part III: Kurosawa Rei was entrusted to take photos of Japanese houses rumored to be haunted houses in the mountains, but met her fiance Aso Youyu who died in a car accident. However, when Kurosawa Rei went home to sleep, he dreamed of an old mansion called "Sleeping Room" and met all kinds of ghosts, including a tattooed "tattoo witch". When Kurosawa Rei woke up from a dream, a snake tattoo flashed ... The things in the dream gradually overlapped with reality, the projector that rejected ghosts, all kinds of ghosts that suddenly appeared, and all kinds of diaries that were picked up in the sleeping house. ...