SNIS-544 From that day when Porchio was developed... Sakurai Ayumi

A female surgeon named Ayumi works at a certain private hospital in Tokyo. She was made the subject of a human experiment after she bluntly rejected her colleague, Dr. Mori, who sought physical relations based solely on sexual desire. The secret experiment conducted within the hospital was... "We've increased Dr. Sakurai's cervical sensitivity by hundreds of times with a newly developed unapproved drug." Ayumi couldn't stop the sensation throbbing deep in her uterus... The woman becomes ensnared by cervical pleasure.