"Life swapping" is a secret fad in society these days. It involves couples swapping partners for a few days. For Yua, who had always thought it was something that had nothing to do with her, her neighbor's offer to "life swap" came as a complete surprise. Yua gave a vague answer, saying that if her husband was okay with it, but to her surprise, her husband replied, "YES." The exchange life began with a mixture of excitement and anxiety.