Housewife Riko (29 years old). Four years into her marriage to a radiologist of the same age. They met at age 20 through a mutual friend, dated for six years, and married at 26. Initially both worked full-time, but she quit her job when her mother fell ill. Their marriage is harmonious, but recently they've had almost no sex life. The reason? Something unexpected. As Riko opens up during intimate moments, the shocking truth behind her awakening to first love is revealed. A two-day overnight trip brings her into contact with a man whose presence uncovers her past. The 180th installment of the hit series explores the emotional struggles of a married woman harboring secrets and the possibility of a new romance.