Episode 182

True Heir is the 15th episode of InuYasha: The Final Act.

Plot
Sesshomaru challenges Inuyasha in order to see if Inuyasha is worth having Tessaiga. Sesshomaru uses a fragment of Kanna's mirror to create a replica of the sword from Tenseiga which is given to him by Naraku. The fight between the two takes place in an unknown place where Naraku sends them for the first part.

The second part of the battle is taken inside a Meidou Zangetsuha created by Seshomaru and is rather between Inuyasha. Seshomaru against the sword that is now manipulated by Naraku. Inside the meidou, Inuyasha manages to defeat the meidou by using the dragon scaled Tessaiga to cut his own yuketsu. That convinces Sesshomaru that he is the true heir of the sword and when Naraku attacks Inuyasha he decides to help him, but not directly. In the end Tessaiga gets the Meidou ability from Tenseiga and that is how Inuyasha and Seshomaru manage to exit the meidou. When Sesshomaru, Totosai inquires Sesshomaru if he was satisfied. Sesshomaru leaves without a word. The sword is handed over to Rin as she leaves with Kohaku back to Sesshomaru and Jaken. Totosai remarks that he is one step away from obtaining his ultimate sword.