在这部战国妖狐 救世姐弟篇动画/奇幻/古装片中,时间为战国时代，世上所具有的各种魑魅魍魉、异形妖怪等非人灵力生物总称为”暗“。喜欢人类的暗——妖狐玉，以及厌恶人类的仙道——迅火，成立了名为“救世姐弟”的组合进行著扫荡罪恶的救世活动，途中遇上了武士兵头真介。另外还有一群专门对付暗的僧侣·断怪众，他们为了消灭对人类作恶的暗“障怪”的以不人道的方式进行人体改造，迅火等人与他们产生激烈冲突！人类当中也有坏人，非人类的存在也不见得都是邪恶的，迅火因过去的事而极其讨厌人类，但在旅程当中，也逐渐目睹到人类善良的一面，他是否能有所转变呢。
The world is divided into two factions: humans and monsters called katawara. Despite being a katawara, Tama loves humans and vows to protect them from evil, even if it means fighting her own kind. Her stepbrother Jinka, however, hates humans, despite mostly being one. The siblings are joined by a cowardly swordsman named Shinsuke, who wants to learn how to become strong. The people they meet, places they see, and creatures they battle will be legendary.
