As his nickname implies, the Fable is an enigmatic assassin who terrorizes the underworld.
The overworked assassin gets an order from his boss.
"Live the life of a normal man for one year. Kill anyone during your vacation and I kill you."　In incognito, the Fable is given the name, "Akira Sato" and his partner is "Yoko." They start their new lives as a regular brother and sister with a pet parakeet and part-time work, etc.
The assassin begins to enjoy a normal life with no body counts but troubles come looking for him. Other assassins are after him and others need his help.
The Fable must survive a life-or-death situation without killing anyone. Can he ever get his peaceful life back...?

在江湖上被称为「传说」的神秘杀手"FABLE（寓言）"，因工作有点太多而得到了来自BOSS的一个特殊的命令：「一年内，隐居于普通人中，不得杀害任何人，如有违反，就杀了你」。
寓言化名为佐藤明，和拍档洋子一共开启了普通人的生活，养养鹦鹉，打打工・・・
可当他们刚刚适应了＜普通＞的生活，杀害寓言的组织，求助寓言的人不断的出现，事态向无法想象的方向急速展开！
在【绝对不可以杀人】的命令下，寓言是否可以解开穷途末路的危机局面，过上平凡普通的生活呢？！