Ep 83. The Female Wolf-Demon and the Lunar Rainbow Promise

Inuyasha season 4 episode 83 is titled "The Female Wolf-Demon and the Lunar Rainbow Promise". The episode begins with Inuyasha's group encountering a female wolf-demon named Koga, who is searching for the shards of the Shikon Jewel. Koga is the leader of a pack of wolf-demons and is known for his strength and speed. He has a rivalry with Inuyasha, who is also searching for the shards of the jewel.

Koga reveals that he is searching for a shard of the jewel that is located in a nearby mountain. Inuyasha decides to join him in the search, despite his dislike for Koga. As they climb the mountain, they encounter various obstacles, including a giant spider demon and a group of demon birds. However, they are able to overcome these obstacles and reach the location of the shard.

Once they find the shard, they are confronted by a group of demon wolves who are guarding it. Koga and Inuyasha fight the wolves and are able to defeat them. However, during the battle, Koga is knocked out and falls off the mountain. Inuyasha rushes to Koga's side and tries to wake him up. It is then revealed that Koga has a special ability - he can see a rare phenomenon known as the Lunar Rainbow, which appears only once every hundred years.

Inuyasha is skeptical of the Lunar Rainbow, but Koga insists that it is real and promises to show it to Kagome, Inuyasha's love interest, in exchange for her help in finding more shards of the jewel. Inuyasha agrees to the deal and they all head back to the village.

Once they arrive in the village, Koga takes Kagome to see the Lunar Rainbow, which appears as a beautiful, glowing light in the sky. Kagome is amazed by the sight and Koga is pleased to have kept his promise to her. However, their moment is interrupted when a group of demon wolves attack the village.

Koga and his pack fight the wolves, but they are outnumbered. Inuyasha and his group arrive to help and they fight the wolves together. During the battle, Koga is injured and Inuyasha must use his Tetsusaiga sword to defeat the wolves.

After the battle, Koga thanks Inuyasha for his help and they part ways. Kagome is sad to see Koga go, but is happy to have experienced the Lunar Rainbow with him. Inuyasha, on the other hand, is relieved to be rid of Koga and continues his search for the shards of the Shikon Jewel with his friends.