该剧讲述幼时父母双亡的女主人公广濑，对打乱养大自己的姐姐的人生的女子黑田美香展开复仇的故事。

Four people lead ordinary lives in different places, their paths never crossing. A mysterious man appears in each story, always as someone else. One moment, a cram school instructor; the next, a truck driver, a barber - his identity constantly shifting. Then, death strikes. A detective pursues the truth, closing in on a revelation...

Two brothers become police officers to hunt down their parents' killer, who escaped justice by just two days before the statute of limitations was abolished.