Another question by @cruncylotusroot
Q: Hello it's me again, I am watching anime final act episode 22 - when Inu turn to full demon why he is remembering the past with Kikyo? I thought he's move on when she die 2nd time, was that Naraku's doing? I doubt it is because that only come to Inu thought without Naraku saying anything. May I know your thought on this one please.
So this is one of those yes and no, kind of answers. These are actually Inuyasha's thoughts but they're being coerced and manipulated out of him at the same time. They are real, but they’re being amplified.
Naraku tells them this not long after they arrive.
The Shikon Jewel desires your souls, the rage that fills your heart, the hate and despair. The jewel wants the darkest parts of your heart.
Now let’s look at what Inuyasha is thinking during the scene that you mentioned.
Kikyo... I didn't know...we both fell into Naraku's trap he set us up to hate each other and then... you chased after me... followed me into death.
...Kikyo I swear to protect you this time. I will never let Naraku hurt you again!
... and then... I failed her again.
Which is then followed by Kagome showing up.
I will always be by your side.
Kagome... I swear I'll give my life to protect you... this time I won't...
The smell of Kagome’s blood from the cut on her arm that he gave her before he pushed her away and his memory of her brings him back to reality again at least for a moment...
So this has been brought up a few times before.
The reason he pushes Kagome away during Royokan is because he believes that he cannot protect her.
He finds himself constantly asking why she stays with him, or apologizing to her when she gets hurt, like he does after the confrontation with Tsubaki.
He’s already failed to keep Kikyo safe once before, he now doubts in his ability to keep Kagome safe. Then Kikyo dies again... and he blames himself again and considers himself a failure only further amplifying his fears of failure... then he snaps back to reality when he sees Kagome and she says “I will always be by your side.”
This line is a very big deal for Inuyasha, because it assures him that Kagome will always be there for him and believe in him when he doubts himself.
Kagome: I couldn’t help it! I wanted to see you!
Inuyasha: She wanted to see... Me?
Kagome: Can I stay at your side?
Inuyasha: You... want to stay?
Inuyasha: I’m sorry Kagome... that you’re always stuck with me.
Kagome: It’s okay... it’s by choice that I’m with
He was allowing himself to wallow in self-pity, until he saw Kagome and she reminded him. If you don’t do something, you’ll lose me. He snaps back to reality because her words give him hope and determination, the ability to break out of that darkness that was engulfing him.
Naraku: Don’t you remember? I suppose not, you haven’t been yourself as of late.
Inuyasha: Naraku what did you do to Kagome?!
Naraku: How poignant. Don’t you remember ripping apart the woman you love?
Naraku: You’ve done it again.
Inuyasha; Not only did you fail to your woman, but Kagome like Kikyo became a blood sacrifice to your weakness.
Inuyasha: Shut up! I killed Kagome?!
Naraku: Inuyasha... allow me to liberate you from your greatest weakness. Forget it all... forget Kagome and your human heart. Know the pure joy of kill, that is what the jewel desires for you.”
So Inuyasha manages to find that hope in order to pull himself up and back to normal, and the moment Naraku sees that he rips it away from him.
Actually using the fact that Kikyo died and that Inuyasha failed again, against him. And when Inuyasha attempts to deny that? Naraku points to the blood on his fingers, and though they were from a minor cut he pushes the idea that Inuyasha instead killed Kagome. It’s with that hope ripped away from him, he’s able to get Inuyasha to succumb to his demon side once again.
So not only did Naraku know about it, he did it because “this is what the jewel desires of you.”
The real kicker of the situation? Kagome was never in any real danger, because she wasn’t going to die, the jewel already had a plan to use Kagome to replace Midoriko, that’s why Naraku pushes the idea for Kagome to kill Inuyasha. Not only would it get rid of Inuyasha it would corrupt her and even possibly, the jewel could have been offered to save him. That’s what makes the situation all the more vindictive on Naraku’s part.
Kagome: In that moment, Inuyasha pushed me away. He helped me escape before he completely lost control.
Naturally any attempt to make Kagome doubt him falls flat on it’s face.
However when this plan falls through, he uses Inuyasha to confront his brother because as Kagome figures out.
Kagome (to Sesshomaru): If you fight your brother, you’ll be falling right into Naraku’s trap.
Because the negativity or the possible death of the other would naturally be what the “jewel desires of them,”
Naturally of course, they do this, Sesshomaru is stubborn and Magatsuhi has possessed Inuyasha’s body, so a fight is going to happen one way or the other. At the start of the fight Inuyasha ends up dropping Tessaiga, which Kagome rushes over to grab in order to use to turn him back to normal.
So while the two brothers continue to clash Kagome is climbing around on the sideline, using Naraku’s body to work her way around, she almost falls at first before stabbing the sword into Naraku’s body to keep herself pinned up. (Small side-note, I love how closely Sesshomaru is keeping an eye on her, he actually turns his attention away from Inuyasha during the stalemate.) However when Naraku forms his body and pushes Kagome off she begins to fall as she calls out to Inuyasha.
Naraku’s words from earlier begin to run through his head, you hurt Kagome, you killed Kagome, you failed Kagome... all that despair and negativity before her voice brings him back. Red-eyed demon, while being possessed by Magatsuhi, he suddenly opens his eyes when he realizes...
Inuyasha: Kagome is alive!
Inuyasha turns not only his attention away from the fight with Sesshomaru, but fights off Magatsuhi to rush over and catch Kagome.
Kagome: Inuyasha...? You saved me? You recognize me?
Inuyasha: I heard your voice.
And it’s with that, we come full circle from Kikyo to Kaou.
All these situations lulled him into feelings of despair and sadness. Kikyo used that sadness and negativity to lull him into a spell to kill him, Kaou did the very same to him during a time where his emotions were at their peak right after Kikyo’s death. Here the combination of corruption, despair, sadness and his own demon blood worked against him.
“I heard your voice.” That says it all.
There is one more thing that I want to tackle.
“I thought he's move on when she die 2nd time, was that Naraku's doing?“
So I addressed the fact that he has trouble moving on because he lost a friend and believes that it was his failure twice. There is a lot of guilt there being packed on-top of him.
He isn’t moving on from that until Naraku is dead. Even though Kikyo is gone, he still has to avenge her death.
The Epilogue actually had a really good line when Inuyasha finds out that the situation involves Kikyo, he bluntly responds with:
Inuyasha: That has nothing to do with me.
Because it doubles as a “This happened before Kikyo even met me.” and “That part of my life is over.” because at this point in time, all that’s in the past, he has a life with Kagome now.