The game's narrative revolves around the events of August 14th, 2009, when Yukihito, the park manager, realized his dream of completing Fancy Island, an indoor theme park. Despite its successful launch and the introduction of a mascot named Mimi, the park faced an unexplained outbreak, hospitalizing 17 individuals. Though the cause remained unclear, Yukihito initially aimed to reopen the park on September 14th. However, this reopening never happened, as reports surfaced of ghosts taking control of the establishment. A clown named Pieyama God seized the park, commanding the ghosts to scare off visitors.
The game's narrative ventures into dark themes, including paranoia, suicide, and depression, categorizing it as an "utsuge" (鬱ゲー, "depressing game"). It combines elements of horror and puzzle-solving, with nearly every page housing intricate puzzles or contributing to a broader enigma. The ending of the game is to access the "gallery".