Episode 155

The Devil that Guards the Shikon Shard is 155th episode of the InuYasha anime.

Plot
Inuyasha, Kagome, Miroku, Shippo and Sango watch as a river of blood that connects this world to the the border of the next pours from the neck of the beheaded Tekei. After some goading from Naraku reminding them that the path will not stay open for long, the companions begin following the river to the borderland before the pathway closes. Myoga makes a plea to Inuyasha not to go. He points out that they have no plan to get back from the borderland.

Sesshomaru, Rin and Jaken come across the remains of the beheaded Tekkei. Sesshomaru notes that while there should have been vast amounts of blood from the beheading, he does not smell any. Kagura appears, taunting Sesshomaru for his tardiness. Sesshomaru demands details from Kagura about the closed entrance, and another path to the borderland.

Inuyasha and Kirara bear their friends through a light and into the borderlands. Inuyasha and Kagome recognize this place as the graveyard where Inuyasha's father's remains lay; where they found Tessaiga.

As Kagome senses the final jewel shard, Inuyasha's eye pulses, and he is thrust into memories of his childhood before Kagome's voice pulls him back to the present. (As he wonders about his vision, he blinks only the eye that pulsed, the same eye that once held the Black Pearl.)

As they approach the remains of the Great Dog Demon, they are attacked by spears of crystal. Myoga pops up and notes that the shards are made of adamant. (What Kagome asks if it's diamond, Myoga has no idea what "diamond" is. Adamant, according to Myoga, is the hardest jewel in the world.)

Kagome sees the glow of the jewel shard within Inuyasha's father. As they approach, the remains of Hosenki comes forth to challenge them. When they ask for the shard, Hosenki tells them that the jewel shard wished to be hidden in the borderland, so that the Sacred Jewel could not be reconstituted and fall into the hands of evil.

There is a pulse of evil and Hosenki attacks Inuyasha. When Inuyasha attacks Hosenki, he discovers Tessaiga cannot break the adamant that protects Hosenki. Kagome sees that the jewel shard Hosenki protects has become corrupted with evil.

As Inuyasha battles Hosenki, he is again struck with a vision of his childhood. As Inuyasha tries to get closer to the jewel shard, Kagome tries to purify the jewel shard by using a sacred arrow but is unable to purify the shard. She tries to draw the arrow Kikyo gave her, but is shocked by it. Inuyasha notes that Hosenki covered the spot that Kagome's arrow hit, and tells Kagome to hit him in the same spot with another arrow. When Inuyasha uses his Wind Scar on the same spot Kagome just hit, pieces of the adamant fall off. Before Inuyasha can take advantage, he is hit and falls into the mist.