Takashi Hiyama works as a cafe manager. He has lived alone with his 4-year-old daughter since the death of his wife Shoko. Shoko was killed by three 13-year-old boys 4 years ago. The three boys were protected by the Juvenile Act, but Takashi and Shoko's mother were hounded by the media and their lives exposed.

Now, even though Shoko's friend (Kana Kurashina) and cafe employee (Yudai Chiba) try to dissuade Takashi, he begins to search secretly for the three boys. Someone then makes an attempt on the boys' lives one by one. Detectives suspect Takshi as he made threats in the media 4 years ago that he would seek out revenge if the boys were not prosecuted. Meanwhile, Takashi tries to find the truth about the three boys.

桧山贵志（小出惠介饰）的妻子被一群少年杀害。但未满14岁的杀人犯受到刑法的保护，刑警没有问责的权利，其相关信息也严格保密。事件发生之后，桧山开始暗自调查重新回归社会的少年们“洗心革面”的结果。就在他开始调查之后，少年们的生命相继受到威胁，桧山便成为了头号嫌疑人。他一边被警察、人权派律师、媒体记者们追踪，一边继续探求事情的真相，渐渐发现了少年法背后隐藏的令人惊愕的秘密

四年前，三名年僅十三歲的少年在五個月大的女兒面前殺害了妻子，卻因為《少年法》的保護，讓他們不用曝光、不用進行公開審判，更不用入獄服刑！檜山所知的，僅僅是「妻子遭三名少年所殺」的可悲事實。沒想到，當時的少年B今天竟也成為某人的刀下亡魂！難道這是遲來的天譴嗎？

소년 범죄에 대한 처벌 문제를 다룬 내용으로 제51회 에도가와 란포 상을 수상한 야쿠마루 가쿠의 동명 추리 소설을 원작으로 한 드라마