Ane no Kekkon

Yori Iwatani, a 39-year-old library worker, has settled into a quiet life in her hometown and considers love and marriage more trouble than they are worth. She plans to live alone, having given up on romance as she approaches 40. Her routine is disrupted when Maki, a handsome man claiming to be an old childhood friend and former classmate, appears. Yori suspects he may be a fraud and tries desperately to avoid him, even though Maki has cared for her since he was a boy. He is also married—to a woman who looks exactly like Yori—yet continues pursuing her.