家路久（木村拓哉饰）原本是证券公司的精英，却因为一起爆炸意外，丧失了5年来的记忆。即使回到家中，妻子（上户彩饰）与儿子都像戴着冰冷的面具，丝毫感觉不到爱情与温暖。相反地在他心中，却对已经离异的前妻（水野美纪饰）与女儿有着依恋。在这空白的5年当中，究竟发生了什么事情，为什么离婚，又为什么有现在的婚姻，解决这些疑问的唯一线索，只有家路久手中的十把钥匙。为了寻找真正的自己，解开所有的谜团，家路久决定以钥匙一一打开通往过去的门。
家的记忆 (季节 1)
Key 1 (集 1) 7.0
播出日期: 2015-04-16
运行时间: 60 min
概述: Hisashi awakens after months in a coma. He returns home to his wife and child, but has no recollection of them or of the past five years.
Key 2 (集 2) 7.0
播出日期: 2015-04-23
运行时间: 47 min
概述: After reconnecting with his old friend Yamanobe, Hisashi asks him about Megumi, but Yamanobe tells him that some things are better left forgotten.
Key 3 (集 3) 7.0
播出日期: 2015-04-30
运行时间: 47 min
概述: Acting on a confused memory, Hisashi shows up to his ex-father-in-law’s memorial service and gets punched out by an angry relative.
Key 4 (集 4) 7.0
播出日期: 2015-05-07
运行时间: 47 min
概述: To recall his past, Hisashi goes to the neighborhood he lived in at the time of his accident and hits it off with the guy living in his old apartment.
Key 5 (集 5) 7.0
播出日期: 2015-05-14
运行时间: 47 min
概述: Hisashi visits his mother's house for the first time since the accident. He finds that his brother's store is struggling, and looks for a way to help.
Key 6 (集 6) 7.0
播出日期: 2015-05-21
运行时间: 47 min
概述: Megumi suggests visiting their vacation home for some downtime, but as soon as they get there, Hisashi’s colleagues crash their family get-together.
Key 7 (集 7) 7.0
播出日期: 2015-05-28
运行时间: 47 min
概述: Feelings of resentment consume Hisashi when his long-lost father appears. Later, he learns Megumi and Kaori were taking the same bread baking class.
Key 8 (集 8) 7.0
播出日期: 2015-06-04
运行时间: 47 min
概述: Hisashi is taken aback by some private files on Megumi's laptop, but then he learns of his own extra-marital affair with a former colleague.
Key 9 (集 9) 7.0
播出日期: 2015-06-11
运行时间: 47 min
概述: Megumi refuses to open up about the past when Hisashi questions her. Hisashi finds a scribbled note that may implicate his company of wrongdoing.
Final Key (集 10) 7.0
播出日期: 2015-06-18
运行时间: 60 min
概述: As a reassignment to Bahrain looms, Hisashi meets with Honjo, who doesn't believe Hisashi's changed. Meanwhile, Megumi visits Kaori in the hospital.
季
集 10