Everything seems to be going great for 36-year-old Asuka, a successful architect. She enjoys her job, and is surrounded by great co-workers. Although she suffered from depression in the past, which resulted in divorcing her husband and abandoning her daughter, she is happy with her independence, and finally things are looking on the bright side. Then one day, after a routine check-up, she is diagnosed with cancer, and is told she only has 3 months to live. Asuka, shocked and scared, keeps her cancer a secret, and makes up her mind to spend her last summer with her 9 year-old daughter, Ayumi, who she hasn't seen in 3 years. Meanwhile, her ex-husband is ready to introduce Ayumi to his fiancé, who he hopes will take over the role as Ayumi's mother. Will Asuka be able to mend the mother-daughter bond that was broken? You'll be moved by this story of a mother who is determined to win back her daughter's heart, as she hides her pain.

对36岁的成功的建筑设计师平木明日香（天海佑希饰演）看似拥有十分成功幸福的人生－她不仅是个有名的建筑师，在职场上如鱼得水，且她身边的同事也个个优秀聪明。尽管过去她曾因产后抑郁症而导致与丈夫离婚，抛弃孩子，然而她却十分满足于自己的独立生活。直到有一天，在例行的健康检查中，被诊断出癌症，只剩下三个月的生命。罹患癌症的明日香试图掩饰自己的病情，决心与三年未曾蒙面的九岁女儿步共渡最后快乐的时光。同时，她的前夫要也正准备向女儿介绍给他的未婚妻，希望未婚妻能够取代明日香原有的母亲地位。明日香能否填补破裂的母女关系呢？我们将看到一个坚强的母亲，独自吞下不为人知的辛酸，尝试弥补岌岌可危的母女关系，并赢回女儿的心。