He mischievously fed his always stern-faced daughter-in-law an aphrodisiac, but the drug was so strong that she awakened into a super-perverted woman with an ahegao face! (Kurokawa Sumire GVH-872)

Oshima begins staying with his son and his wife in Tokyo. However, Oshima finds his son's wife, Sumire, a cold and perpetually expressionless woman difficult to get along with. One day, their son, Tetsuo, is hospitalized due to an injury. During their awkward time alone together, Oshima, on a whim, tells Sumire a lame joke: "My son died in the hospital..." To his surprise, Sumire, usually expressionless, shows an expression of extreme astonishment, her eyes practically bulging out of her head. Oshima is stunned by this expression and, wanting to see more of Sumire's antics, begins to play pranks on her like a prank show, but Sumire maintains her placid demeanor. Finally, Oshima decides to target the suspicious medication...