Agawa Kayo is an upright young woman who earns a living by working part-time at a convenience store. She suffered trauma from some experience in the past and a certain incident makes her decide to become a volunteer probation officer. A volunteer probation officer is a civil servant who helps rehabilitate juvenile delinquents and criminals but receives no pay. They are simply volunteers with a sense of public spirit. After going through a workshop, Kayo who has just become a volunteer probation officer is put in charge of her first case, Saito Midori. The owner of an accessory shop, Midori behaved violently towards an employee and has been released on parole after serving a two-year sentence for extortion and assault. Under the guidance of probation officer Takamatsu Naoharu, Kayo struggles to help her find her place in society.

人気コミック「前科者」を有村架純の主演で、連続ドラマ＆映画という形で実写化した社会派ヒューマンドラマ。“前科者”たちの更生、社会復帰を目指し、保護司が奮闘する。

　　刚成为保护司的阿川佳代与前科者们面对面，共同以更生、回归社会为目标而奋斗。因恐吓及伤害罪而假释的齐藤绿、因杀人罪而服刑的石川二朗、因违反兴奋剂取缔法而被判缓刑的田村多实子。佳代为了这不同类型的“前科者”，愤怒、哭泣、奔跑。

阿川佳代是一名兼職的保護司，負責協助更生人或不良少年等重返社會。在汽車維修廠工作的假釋犯工藤誠，話不多但十分努力。經歷過童年創傷的他，曾在麵包工廠工作期間飽受暴力與霸凌，最後刺死一位同事。儘管工藤聲稱對所犯的罪刑毫無記憶，但也向阿川承認害怕自己會再度殺人。

죄를 범한 "전과자"들의 갱생·사회 복귀를 지원하기 위해, 자원봉사로서 보호사를 맡은 주인공의 성장을 그리는 휴먼 드라마