A couple with a strong sense of smell, Mitsuki and Souta are plagued by their neighbor's foul odor. When Souichi, a man known for making his room unusually stinky after masturbating, refuses to address their complaints, they decide to confront him directly. However, things take a turn for the worse when Souichi locks them in his room and forces Mitsuki to endure an unwanted first kiss that leaves her mentally shattered. As she becomes increasingly aroused by the smell, she eventually accepts having sex with Souichi. Meanwhile, Souta returns home unexpectedly and catches Mitsuki deeply engaged in a passionate creampie session with Souichi.