The legendary genius killer "Fable" (Junichi Okada) can kill any target within six seconds. He is a ruthless character that makes the underworld tremble with fear. In response to the order of the "boss" (Kouichi Sato), he and his partner (Fumino Kimura) disguised themselves as siblings and lived an ordinary life under the alias "Akira Sato". They were not allowed to kill anyone during the year they lived in Osaka... One day, he accidentally met a mysterious wheelchair girl (Yurina Hirate) and Utsuho (Shinichi Tsutsumi), the founder of a non-profit organization who seemed to care about the future of children. All these unusual things reminded Fable of the assassination mission four years ago. Faced with the many crises that are about to come, can Fable continue to abide by the order not to kill and protect himself and his relatives and friends?