In a cave filled with cursed energy, Inuyasha and Miroku find a grotesque amalgamation of demons—created through a deadly ritual. Inuyasha battles to protect Kagome, but killing the creature risks absorbing it. Suddenly, Kikyo appears, purifying the evil with a sacred arrow...

The legendary swordsmith Tōtōsai forges two mystical blades: Tetsusaiga for Inuyasha, and Tenseiga, a healing sword, for Sesshomaru. Displeased with a sword that can't kill, Sesshomaru demands another. Tōtōsai runs—and tells Inuyasha that he must face Sesshomaru again...