IPZ-437 Sayuri Honjo gets raped in front of her husband

Yoko lives an ordinary but happy married life with her husband, whom she met at her previous workplace. Although the two were modest, they were eager to set up a new home and live in a new world. The two go to greet the residents upstairs. The person who peeks out from the open door with a strange odor is Kamata, who has run away from his girlfriend's wife and is now living as a widower. A married couple's happy daily life is turned into a nightmare by the hands of a lonely, powerful demon.