Ane no Kekkon

At the library, Iwatani Yori, a 39-year-old woman, prefers a peaceful life without the complications of love and marriage. However, her tranquillity is disturbed when a dubious yet attractive man approaches her, identifying himself as an old friend from her childhood - Maki. Maki had been taken care of by Yori since he was young, and although he is now married to a woman who resembles Yori, he persistently pursues her. Yori struggles to keep him at bay, but with Maki's relentless pursuit, what kind of future does this love affair hold?