SDMU-827+ Ayumi (20 years old), an ordinary small-breasted girl who works part-time at a pub and serves as a sex partner for an AV actor. A homemade video is being sold to the public, in which a woman's uterus is penetrated by a huge penis and she moans obscenely. Her AV debut and anxious expression suddenly changed as her sensitive nipples were touched and she turned into a woman.