该片是由东野圭吾为了纪念出道30周年而创作的同名小说改编而成,讲述了爱女瑞穗因为意外成为意识不清的病危之体,播磨薰子与播磨和昌夫妻俩面临难以抉择的局面的故事。Separated mother Kaoruko who has two offsprings from her estranged husband awaits the graduation of their daughter for the divorce proceedings to begin and subsequently be finalized. That is the couple's agreement. Tragedy strikes when the daughter will never graduate. She is comatose and brain dead due to an accident. The dilemma is whether to pull the plug and donate the girl's organs or await indefinitely to see if an unlikely healing will occur.