殺生丸が犬夜叉に問答無用で戦いを仕掛けてきた。しかも殺生丸の天生牙は、神無の鏡の破片の力で、犬夜叉の鉄砕牙の能力を奪い取れるようになっていた!! 情け容赦ない殺生丸の攻撃に、犬夜叉もついに本気に……。
（51巻2-6、2008年7月30日から高橋留美子展で上映）
A 30-minute Inuyasha feature titled Kuroi Tessaiga screened on Takahashi Rumiko's picture exhibitions across Japan.
In January 2010, this special ended up, slightly edited, as episode 15 of Inuyasha Kanketsu-hen.
Kagome leads a fairly normal life, in spite of her weird family. Her house is a thousand-year-old Japanese temple, and her grandfather talks about the history of the house endlessly. Legend has it that the old well on the temple grounds keeps a vicious ancient monster at bay; Kagome never believed those legends, until now. The well opens up and sucked Kagome inside transporting her to an ancient time of enchanted forests and giant demons.
犬夜叉、戈薇、弥勒、珊瑚、琥珀众人随杀生丸等同行。杀生丸原本就对父亲将铁碎牙传给犬夜叉耿耿于怀，当领悟到父亲有意令冥道残月破融进铁碎牙时心中更是充满怨恨。正值此时，神无的白夜出现，将镜妖的碎片留下。杀生丸把碎片融入天生牙，随即生出足以和铁碎牙媲美的魔刀。虽然知晓奈落企图让他们兄弟厮杀，从中渔利，但恼怒之际的杀生丸还是向犬夜叉发起攻击。在“无尽的梦境”中，这对兄弟的厮杀旋即展开。正邪铁碎牙，孰将胜出……
本片为少年周刊Sunday创立50周年特别篇，诸星当、拉姆、乱马、犬夜叉、戈薇等多部经典漫画角色一同登场。
Le 30 juillet 2008, un OAV de 30 minutes nommé Le tessaïga noir (黒い鉄砕牙?) est diffusé pour la première fois lors de l'exposition It's a Rumic World à l'occasion du 30e anniversaire de carrière de Rumiko Takahashi. Il s'agit d'un passage du tome 51 qui sera reconverti en épisode 15 de la saison Kanketsu Hen (Seitonaru Keishosha).
Sesshōmaru quer ver se Inuyasha é digno de empunhar o Meidō Zangetsuha, por isso desafia-o para ver se consegue dominar a técnica que tanto trabalhou para dominar. Naraku decide usar o ódio de Sesshōmaru por Inuyasha, dando-lhe uma vantagem injusta e familiar, esperando que a luta termine com a morte de Inuyasha.
