This is the story of a brave female student who repeatedly becomes pregnant and gives birth in order to revitalize the town and combat the declining birthrate.

The story takes place in Kaminoko City, a depopulated provincial city plagued by a declining birthrate and an aging population, as well as shuttered streets. Mizuguro Ruri was an ordinary female student born and raised in Kaminoko City, and worked hard with the people in the shopping district to revitalize her beloved town.
One day, she is appointed as a “Bubble Princess” who provides sexual services and impregnation for the “Birth Promotion Program,” the country’s “last resort for combating the declining birthrate.”
Although confused, she provides sexual services to men every day in order to revive the shopping district where she was born and raised. What will be her fate…?