Episode 187

 Naraku finally succeeds in obtaining the final shard from Kohaku and fully restores the Shikon Jewel to its original form. Sango thinks that her younger eleven-year-old brother is dead since the Shikon Jewel shard was the only thing that sustained his life. However Kikyo's light detaches from the shard and transfers to Kohaku, saving his life. But without the pure light the shard becomes defiled along with the jewel. With the Shikon Jewel finally complete the final battle between light and darkness, good and evil begins!

Note: This is episode twenty of "Inuyasha: The Final Act" and it is titled "When the Jewel Is Whole."