婚后不久就失去了妻子的榎本靖（堺雅人 饰）和在交通事故中失去丈夫的由香（药师丸博子 饰），在命运的相遇后两人相爱并结婚了。不久，他们有了两个孩子，香织（宇野爱海 饰）和洋介（吉川史树 饰），一家四口在新建的房子里开始了新的生活，非常幸福。

　　但是有一天，因为由香的过失导致火灾烧毁了房子，幸好没有家人受到伤害，但由香却因为这次火灾，内心受到了巨大的冲击失去了所有的记忆。经医生诊断，由香患得的是解离性健忘症。就在这时，榎本靖的工作也发生了变动，一脸串的事情让他不知所措，但是他仍坦然接受了这一切……

Yasushi and Yuka, who have both lost their spouses in the past, are brought together by fate and lead a happy life together, blessed with two children. Then one day, their new house, which the couple had painstakingly built together, catches fire due to Yuka's carelessness. Fortunately, no one in the family is seriously injured and Yasushi is relieved, but the shock of the fire causes Yuka to suffer from a neurological disorder called dissociative amnesia, and she is unable to remember even her own name. The doctor tells her that there is no clear cure in modern medicine, which shocks Yasushi, but she accepts Yuka in her current state and decides to walk with her again.