Kanokagura Mito is a spectacled girl who works as a demon exorcism product production engineer and runs a demon exorcism and detective business. She sets out on a job to exterminate a demon that is lurking in an abandoned school in a certain village, but is kidnapped by the client and thrown into the abandoned school as a sacrifice. It will be an escape game with the purpose of escaping from the school while being gagged, bound, swallowed whole, and mummified.​