Igarashi Mari, 50 years old. She's dissatisfied with her husband, who is obsessed with birdwatching—a hobby that keeps him constantly away from home. But while he's gone, she's been secretly involved with a younger boyfriend, three years her junior, revealing her naughty side. This time, she confessed to her lover her desire to "see you with someone else," and actually posted a request about it on a website, setting the stage for what's to come.