Yamazaki is a 74-year-old man who likes to be sexually abused. He was very handsome when he was young, but now that he is old, it is difficult to accept that his beauty has disappeared. Perhaps he was so intoxicated by his beauty that he had never been in love. One night, Yamazaki joined up with a sex worker named Leo and fell to the ground while having sex. Later, Leo discovered that the old man was the author of his favorite book when he was a child, and slowly began to become interested in his past and life. This is a story about two people with very different backgrounds. What will your mood be after your beauty disappears? Sex and love, what is it? Old Narcissus tries to find some answers from an extraordinary story.