◎Yumi, 28 years old◎ Married for 4 years◎ No children. Her husband runs a small design company and is a total workaholic. That's why she always felt secure. But recently, she started sensing something off. One day, her husband came home exhausted after an all-nighter—and his jacket had a lipstick stain on it. She didn't want to suspect him, but his eyes kept shifting nervously... Suddenly overwhelmed by loneliness, she posted on a dating site. Just hours later, she met up with an older man. After a long time, she went on a date with a man and headed to a hotel.