Hisae Yabe, a beautiful married woman, lives peacefully with her loving husband, dreaming of holding her first grandchild in her arms. Her daughter and son-in-law are deeply in love and tirelessly trying to conceive, yet pregnancy never comes. One day, while cleaning the bathroom, she overhears the couple whispering. To her shock, they make an unthinkable request—asking her to become their surrogate. Worried for her daughter's happiness, she makes the fateful decision to carry their child. This is the story of a mother who steps into forbidden territory, surrendering her body to her son-in-law for insemination, crossing the line of incest in a desperate act of love. A taboo pregnancy begins, filled with creampie after creampie, as emotions and desires spiral out of control.