Mio and her husband have been married for two years. Mio was unsatisfied with her husband, who was kind and sincere but not masculine. At that time, a colleague of my husband's company who often comes to visit Mio's house. A colleague likes Mio and urges Mio to have a relationship while her husband is away. At first, Mio resists, but Mio is also attracted to the masculinity that her colleague's husband does not have.