Mito and Souta are a clean-freak couple who are sensitive to smells, but they are bothered by their neighbor's strange odor. A man named Gomi makes the room smell abnormally bad after masturbating, so they go to complain, but are ignored. Later, they are locked in Gomi's room and Mito is forced to have a first kiss that is far from her ideal, leaving her mentally devastated. Mito gradually begins to feel pleasure from the smell, and accepts having sex with Gomi. Souta returns and witnesses Mito and Gomi having loving, creampie sex.