The search for the final shard of the Shikon Jewel leads Inuyasha and the gang to a mountain fortress, but the gate is guarded by two giant statues and a force that will only allow the dead to enter. Seeking a path to the underworld, Naraku meanwhile teams up with a new demon.
Kagome faces a difficult decision - only she can help Kikyo heal from Naraku's miasma. Will the love triangle between Kagome, Inuyasha, and Kikyo stop her from doing the right thing?! Kohaku comes under Naraku's power and is ordered to steal the infant Hakudoshi. Will Kohaku be able to resist? While Inuyasha and his comrades watch, Naraku shows up at the demon bird's nest for a showdown.
A fierce battle rages in the borderland lying between the world of the living and the afterlife. A mysterious force is attacking Inuyasha and preventing him from obtaining the last Shikon shard. This force claims to be acting on behalf of the will of the shard! Inuyasha also faces the dreaded Naraku, who will stop at nothing to obtain the shard.
Inuyasha and the gang follow a trail of rumors that lead to a "living mountain." Naraku has awoken the mountain from its 200-year slumber and stolen its sacred stone. The "living mountain" then gives a gift to Inuyasha and his group to help them in retrieving the stone. But what could Naraku be hoping to achieve?
Almost HumanA new crop of demons is plaguing the land. The more demons are killed, the more humanlike they become. This progression culminates in a battle between the gang and Moryomaru, Hakudoshi's new and fearsome creation. Can Koga and Inuyasha stop their in-fighting long enough to battle a common enemy?
Inuyasha and the gang are holding fort at a temple with the weakened Goryomaru. Kaguara attacks the temple while searching for the infant with Naraku's heart. Inuyasha remains unsure whether Goryomaru is an enemy of Naraku. Kagura becomes seriously wounded, but is it for good? Perhaps Naraku has one more task for her?
Inuyasha and the crew are locked deep in combat with the scheming Hakudoshi. In a rare moment, Inuyasha fights on the same side as Kagura. It seems that Hakudoshi will stop at nothing to achieve his goals, but will he succeed?