Watanabe Mitsu is happily married to her second love, Ryota who was a patient at the eye clinic where she works. He is a nice man who puts her first and even cares about her mother, even though he is completely different from the popular guys she had dated in the past. He is a good catch as a husband and she could not have asked for anything more. But her firstlove is Arishima Koki from junior high school days. The one who moved out one day without telling her. After that, Mitsu had dated men who look like Arishima and even now, her eyes still follow men who resemble him. Then one day on the way back from a drinking session, Mitsu happens to meet again Arishima, whom she believes to be the man of her destiny, and they begin an affair.