High school student Yusuke Yamamoto has a sad past of losing his mother when he was born. Therefore, Yusuke works hard at his studies to become an obstetrician and gynecologist like his father and try to help weak women, but he also has a weakness of gynophobia. Worried about his son's predicament, his father hires a beautiful nurse duo as a live-in. However, the twin sisters, Yuka Nakamura and Rika, are Yusuke's childhood friends, and the cause of the trauma that made him a gynophobia when he was young...!