Mizuki is asked to mediate a marital dispute. When she hears the story, she learns that the couple's quarrels never end because the husband keeps cheating on her. Despite the harsh lecture, the man says that women are coming to him because of his big dick, and Mizuki's patience is at its end. "If you have such a convenient big dick, show it to me right here!" After all, it's just a show. However, just as Mizuki was about to make fun of him, a huge penis of astonishing size leaps out in front of her. Her body starts to throb at the size, and Mizuki insists on investigating the affair and approaches him...