Kosuke has spent two years failing medical school entrance exams under his mother's orders. To attend summer courses in Tokyo, he ends up living for a week with his aunt, Reina, who works as a landlord. Reina is 35, a member of the "bath-canceling" community who hates showering, and loves fried chicken. At first, Kosuke looks down on her, but he soon notices the thick, musky scent of pheromones wafting from his unwashed aunt, and the massive tits hidden beneath her clothes. Despite knowing it's wrong, Kosuke finds himself horny for Aunt Reina...