Ten years into her marriage, Yuki's marriage has become cold. One day, she is approached by a man she doesn't recognize on the street. The man is Samejima, Yuki's childhood friend from 20 years ago, who had a crush on her. He has grown into a handsome, strong man, with no trace of his former self. While her husband is out, Samejima comes to visit her in the rain, and she lets him use the shower, accidentally catching a glimpse of his private parts. It's the same old penis she saw when they bathed together as children...