Zenitsu Agatsuma respects you so much; the first person he thinks of when something good happens is you. Kuwajima Jigorō treated you like family, teaching you everything he had without reservation.
And Mr. Himejima, he took you in when you were homeless and also treated you like family.
Why betray them? Why abandon your humanity and become a demon?
Chiba Yo felt the rage in his chest was about to overflow.
He could already imagine how heartbroken Zenitsu and Kuwajima Jigorō would be if they found out about this, especially Kuwajima Jigorō. As Kaigaku's trainer, if his disciple betrayed the Demon Slayer Corps and became a demon, he might even have to pay with his life according to Corps rules.
Chiba Yo couldn't understand. He knew the term 'biting the hand that feeds you,' but he never thought someone could be so heartless. He wanted to kill everyone who truly cared for him, without a shred of good left.
The word 'selfish' was no longer enough to describe him. Even self-interested people mostly wouldn't harm others, yet Kaigaku could betray his benefactors without hesitation for his own gain.
He was pure evil, evil to the point of being nauseating.
"Shut up! What do you know! Zenitsu Agatsuma and that old man should die!
Zenitsu Agatsuma is a useless good-for-nothing! All he does is cry all day, without any self-respect or perseverance.
But that stinky old man actually made me inherit Thunder Breathing with that good-for-nothing! And he spent so much time on him. He's completely a muddle-headed old fool with no discerning eye!
And that blind man, if the other brats at the Temple hadn't driven me out, how could I have encountered a demon at night?
Didn't I just steal a little something from someone? And they kicked me out because of that. They deserved to die!"
Kaigaku, instead, roared at Chiba Yo with a furious face, his words full of dissatisfaction. He didn't recall even a bit of kindness others had shown him, nor did he ever reflect on whether his actions were correct.
Listening to him, Chiba Yo's body even began to tremble. He remained silent, because he now knew that this fellow in front of him would only remember others' mistakes.
Even if it wasn't caused by the person themselves, or couldn't even be called a mistake, even if it was the right thing to do, as long as it harmed his interests, the other party became an object of his resentment, and he didn't care how much that person had done for him.
To describe someone ungrateful, people often use terms like 'wolf-hearted' or 'white-eyed wolf.'
However, wolves, as pack animals, understand teamwork, help each other, and dogs are incredibly loyal to those who feed them.
Compared to these two animals, this fellow in front of him was far inferior.
Kaigaku didn't stop, continuing to list others' "sins."
"And that blind man didn't even notice I was driven out. He deserved to be thrown into jail, but it's a pity he wasn't executed in the end, and even joined the Demon Slayer Corps.
If he had been executed then, I wouldn't have had to avoid him in the Demon Slayer Corps."
Kaigaku became a bit calmer at this point, but his words were still sharp and mean-spirited.
Then he seemed to remember something and suddenly started laughing.
"Speaking of which, that guy seems to have misunderstood some things.
The children who died in the Temple back then weren't trying to escape; they were trying to help him fight that demon. I saw that bald brat climb to the window to reach for the farm tools outside, and the next second he died, hahahaha!
When I heard that blind man no longer liked children, I almost died laughing. How ironic! It would be even more fun if Sayo, who survived, met him again and he took revenge, hahahaha!"
Kaigaku laughed wildly, revealing the full truth of that year.
"Enough... shut your mouth..."
Chiba Yo said to Kaigaku.
However, Kaigaku didn't stop and turned his attention to Chiba Yo.
"Oh, I almost forgot about you. You're even more short-sighted and stupid than that stinky old man. You're willing to teach that crybaby good-for-nothing but not me, who has more talent.
And you're the one who told that blind man about my presence in the Demon Slayer Corps, right?
All of you, who are blind and refuse to acknowledge my strength and talent, are evil!
I will kill you first, then that blind man, and that stupid master and disciple pair, and everyone who has ever mocked me!
You will all be executed by me, one by one!"
As Kaigaku spoke, he threw down the arm in his hand and slowly drew his nichirin blade.
"There's no point in saying anything to someone like you. A lonely death is your best destination..."
Chiba Yo looked at Kaigaku, his eyes devoid of color at that moment. Endless rage surged through his mind and head, even making him feel a bit dizzy.
This was the most repulsive, even nauseating, person he had met since coming to this world, not even beneath Muzan.
"I see you can only talk big now. I'm not who I used to be!
As a demon, I'm countless times stronger than I was then. Even you, as a Hashira, can't match me!
You only defeated Lower Moon Two, but I am now Upper Rank Six!
Killing you will even earn me a reward from that esteemed person, making me even stronger!"
Kaigaku fully drew the weapon from his waist. Black lightning patterns clung to the dark gold blade.
When he went to inherit Upper Rank Six, Muzan also sent him an image of Chiba Yo, telling him to kill Chiba Yo. Because Muzan was in a bad mood at the time, he didn't dare to ask why.
However, he was quite happy with this mission, as it perfectly aligned with his own thoughts, making him once again marvel at how becoming a demon was the correct choice.
"I remember you never seemed to learn the First Form of Thunder Breathing, did you?"
Chiba Yo placed his right hand on the hilt of his blade and calmly asked Kaigaku.
This single sentence directly enraged Kaigaku. Not knowing the First Form had always been a sore spot for him.
"Even if I don't know the First Form, it's enough to kill you! Thunder Breathing, Second Form: Rice Spirit!"
Kaigaku, infuriated by the remark, charged at Chiba Yo and attacked directly. Five lightning-shaped consecutive strikes were unleashed the moment he activated his Breathing Technique. The lightning, turned black by his Blood Demon Art, would tear the opponent's skin upon impact and inflict a continuous burning pain.
Compared to that person, this guy standing in front of him felt no pressure at all; his strength was definitely half-baked!
Kaigaku thought as he looked at Chiba Yo.
"In that case..."
Chiba Yo remained standing there. Only when Kaigaku's attack landed on him did his figure vanish in an instant.
What? So fast!
Kaigaku, who thought his attack had succeeded, had his sneer freeze on his face at that moment, turning into shock.
Although Chiba Yo's figure disappeared from Kaigaku's sight, his voice had not yet faded.
"Then I'll let you die by the First Form of Thunder Breathing..."