故事发生在昭和49年的东京。在东京都的丰岛区千里，居住着94岁高龄的画家熊谷守一（山崎努 饰）。熊谷守一和妻子秀子（树木希林 饰）拥有一个温馨的家，一条门廊，一片小院。每一天，熊谷守一都能够从自家院子的自然里感受到生命与季节和时间的变迁，这个院子里的一切就是他的生命。他和妻子都做已经参透了生活的奥义——生命的意义并非是钱可以买来的。可是，这样的院子旁边即将盖起一栋高耸入云的公寓大楼，大楼的影子将投射到他家的院子里，这也就意味着在那里的生命都将失去阳光……

Set one year after the fight between detectives Saya Toma, Takeru Sebumi, and Satoshi Chii. More confrontations ensues between the detectives at the Unidentified Crimes Unit of the Tokyo Metropolitan Police Department. Takeru Sebumi returns after taking a break due to his eye problems. Kenzo Ichiyanagi is appointed section chief, while Kotaro Nonomura is demoted. New member Shu Kikkawa joins the team.

On the outset, the Okunos seem like a normal happy family with father Tadashi and his two bright sons, genetics researcher Izumi and artsy Haru. When a series of arson attacks strike the neighborhood, clues left at the crime scenes seem to be somehow related to the Okunos. Izumi and Haru try to get to the bottom of mystery, slowly unveiling a tragic family secret that has come back to haunt them.