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.

Trivia

 * When Inuyasha and Sesshomaru clash swords in the Path to the Underworld, it bears similarity to the opening Grip!, where Inuyasha clashes weapons with Bankotsu.
 * Sesshomaru's mental picture of Naraku depects him as he is now. However, Sesshomaru's last meeting with Naraku was before he absorbed Moryomaru and killed Kikyo, meaning he should have pictured Naraku as he looked since their fight in the Borderland.
 * It is quite strange that the Adamant Barrage didn't break through the barrier generated by Tessaiga's sheath, but the "Crimson Tenseiga" could.


 * The miniature moon created by Byakuya for transporting Inuyasha and Sesshomaru to another dimension is anime-only; in the manga, the scene just shifts to the dimension after every is surprised by their disappearance.


 * This is the only time Naraku uses Byakuya's "eye demon" to spy on his enemies.