Inuyasha met and fell in love with the priestess Kikyo, who was tasked with protecting the Shikon no Tama (Sacred Jewel), a powerful jewel that could grant a wish and that Inuyasha believed could make him a full demon. Through interacting with Kikyo, who was also living a lonely and isolated life, Inuyasha relinquished his dream of being a full demon and instead he and Kikyo planned for him to use the Shikon Jewel to become a human so that he could live with her. However, Naraku manipulated them into believing they had been betrayed by one another. Before Kikyo died, she shot Inuyasha with a sealing arrow that bound him to the Sacred Tree. Inuyasha remained there for 50 years, until Kagome Higurashi pulled out the arrow, breaking the seal. When the Shikon Jewel, which had previously been embedded in Kagome's body, was shattered into fragments that scattered across feudal Japan, Inuyasha and Kagome traveled together to retrieve the shards with Inuyasha once again seeking it to turn into a full-fledged demon.
LOTM: The Angels Return
In this story, Inuyasha has managed to break free from the magic necklace Kiede put on him to keep him under control. Sadly and maddeningly for him, Kagome was quite abusive with her ability to control him. She also seemed more interested in the wolf demon Koga, who in fact made a promise to marry Ayame from another wolf demon tribe.
Inuyasha has sent their other companions away, upset that they seemed to side more with Kagome and is not above brutally giving Kagome a taste of her own medicine! However, he is very polite to the Angels and Autobots...and brutally demands that Kagome do the same!
As it turns out, Inuyasha is also able to understand Bunnicula.
After the fight with Naraku...and the painful death of Kikyo...Inuyasha asked to come with the Angels, not only believing he could be useful, but feeling that there was nothing for him in his world at that time. Luckily for him...and as usual...the Angels were delighted to have him join.