[Showa Edition] Ozaki, who is in the 10th year of the university ronin, came to the boarding house introduced at the boarding house, but there is a boarding house where the widow Yuko (Kaoru Kira), who has a large amount of debt, is working alone. So ... [Heisei edition] Ozaki heads for the exam, but the perpetrator is Miyuki (Reno Aihira), who runs a boarding house, and shakes the stick for a year ... [Reiwa] Disappointed to find out that the widow's boarding house has disappeared, Ozaki finds a share house run by a woman named Alisa (Chisa Hasegawa)... Fourth film in the "Widows Boarding House?" series directed by Daikei Shimizu.

Sorry I made you wait! ! The 9th installment of the popular series "When I transferred schools, I was the only man..."! ! When I went to a new school, I found that my only classmates were female students! ! I am in a harem state and do naughty things with everyone every day! ! Please try experiencing the dream-like world with this work! !

Yuko, a former lawyer, falls into a trap set by her rival and loses both her lover and her career. By day, she works as an assistant at a detective agency, and by night, she uses her exceptional sexual skills to fight evil, but she finds herself in a desperate situation.

Yuko's lover, Takeo, dies in the womb during an affair, and his wife kicks her out of their apartment. Left homeless, she is picked up by Niyama, the president of a printing company, who comes to deliver flyers, and begins working for him as a live-in employee.