Ryo, in her 10th year of marriage, is leading a cold married life. One day, she was approached by a man she didn't recognize on the street. That man was Haneda, a childhood friend who had feelings for Ryo 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 Haneda a shower after he visited her in the rain, she accidentally witnessed his dick. Ryo, who lost her reason to Haneda's big dick, which she couldn't have imagined from the thick dick she saw when they took a bath together when they were young…