Eight years into her marriage, Nami's married life has become cold. One day, she is approached by a man she doesn't recognize on the street. The man is Odagiri, a childhood friend from 20 years ago who had a crush on Nami. He has grown into a handsome, strong man, with no trace of his former self. Then, while her husband is out, Odagiri comes to visit her in the rain and she lets him use the shower, and by chance, she sees his private parts. Nami loses her mind at the sight of Odagiri's large penis, which is completely different from the small penis she saw when they bathed together as children...