Shoko, who no longer finds meaning in marriage, goes on a trip alone where she meets an attractive man. But, when he invites her to dinner, she lies to him, telling him that she is married, and using her sister Yoko's wedding ring.

Shoko spends a memorable time with Jyo. However, she realizes that she lost her sister's wedding ring. Meanwhile, her sister Yoko is enjoying a date with a cute young guy on the pretense that she is on a business trip.

Shoko gets back the wedding ring that Jyo had, but she feels lonely, knowing that now she will never see him again. Meanwhile, Jyo is suffering from headaches and dizziness that no one yet knows about.

Shoko feels guilty for lying to Kenji in order to cover for Yoko's affair. On the day of the trip with Jyo, Shoko heads for the station where he is waiting, but unexpected trouble awaits her.

Shoko and Jyo grow apart despite their feelings for each other. Yoko fears that her husband has found out about the affair. Meanwhile, Jyo's doctor is concerned that Jyo refuses to undergo surgery.

Having Futa's match take place on the day of her trip with Kenji, Yoko faces a tough decision. She tries to get out of it by involving Shoko again. Meanwhile, Jyo confides his true feelings to his doctor.