InuYasha: The Final Act

In Pursuit of Naraku (1x14)

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Toutousai confirms that Sesshomaru's father gave him Tenseiga so Sesshomaru could perfect the Meido Zangetsuha, then have Tessaiga reabsorb Tenseiga. Meanwhile, Naraku takes advantage of Sesshomaru's absence and tries to take Kohaku's shard, but is annoyed to find that it is still being protected and purified by Kikyo's spiritual powers. Kohaku fights Naraku alone, to protect Jaken, and protecting Rin as well. InuYasha's group arrives and Naraku tries to taunt Sango by claiming Kohaku runs from her to forget his past. She states that she already knew that, but will still fight for him when he needs her. She attacks with Hiraikotsu and to her surprise, it now has its own demonic energy and it is able to injure Naraku. InuYasha follows up with an Adamant Barrage attack, Kagome fires one of her sacred arrows, and Miroku attempts to use his Wind Tunnel, but the severely injured Naraku manages to flee. Afterward, Kohaku tells them that because his jewel shard is still pure, they may still be able to use in the final battle with Naraku.