Yuki, who is in her 10th year of marriage and leads a cold married life. One day, she was approached by a man she didn't recognize on the street. That man was Samejima, a childhood friend who had feelings for Yuki 20 years ago. He had grown into a handsome and strong man, with no trace of his former self. And then, while her husband was away, when she lent Samejima a shower who came to visit in the rain, she accidentally witnessed his dick. Yuki, who lost her reason to Samejima's big dick, which she couldn't have imagined from the rented dick she saw when she took a bath with him when she was a child…