The smell (pheromones) of my aunt, whom I haven't seen in a long time, is too erotic and dangerous... Kosuke, who has failed the entrance exam three times, ends up staying with his aunt Mina in her house in order to attend a cram school in Tokyo. And on the day of his entrance exam... Kosuke can't hide his surprise at Mina's room, which has turned into a "trash room," and the "smell" that can be detected even from far away. "A bath? When was the last time I took a bath...lol." The combination of the trash room with a broken air conditioner, the aunt's hidden big breasts, and the suffocating pheromones drives Kosuke crazy, and the two of them cross the line...