母から命じられて医学部を受験し続けてはや2浪…東京での夏期講習に通うため大家をしている叔母・玲奈の元で1週間生活することになった浩介。35歳・風呂キャンセル界隈の住人・好きな食べ物はから揚げー。そんな玲奈のことを少し蔑んだ目で見ていた浩介だったが…。しかし浩介は気づいてしまう、風呂に入らない叔母からムワッと立ち込めるフェロモンの香り、そして今まで知らなかった叔母の服に隠れていた爆乳にー。イケナイと知りつつ叔母の玲奈に思わず発情してしまった浩介は…。

Having failed the medical school entrance exam twice already, at his mother's command, Kosuke is staying for a week at his landlady's house in Tokyo to attend a summer course. Reina is 35 years old, a resident of the "bath-skipping" neighborhood, and her favorite food is fried chicken. Kosuke initially looked down on her, but then he noticed something: the pheromone scent emanating from his aunt who never bathed, and the enormous breasts hidden beneath her clothes—something he'd never known before. Knowing it was wrong, Kosuke finds himself unexpectedly aroused by his aunt, Reina…