In the world of the "Kimetsu no Yaiba," Isao had gotten the DNA of the strongest Demon Slayer, Yoriichi Tsugikuni.
During his several years of stay in that world, he went on a trip, and by using the memory of Kokushibo, he knew where the corpse of Yoriichi was buried.
Despite Kokushibo's transformation into a demon, his love for his little brother remained. He took great care in burying Yoriichi's corpse, which made Isao able to devour it without difficulty.
How strong was Yoriichi?
There was no question of how talented he was since he was a child; he could even defeat an adult warrior with ease, even though he had never done training. When he was born, he could even see through a human body naturally.
His talents were undoubted, and he was the creator of the breathing styles, even helping others develop styles that were suitable for them as they were unable to master the original breathing style.
Moreover, unlike the others, Yoriichi was also able to live until his old age, and his power never diminished.
Isao knew that he might be cursed for devouring Yoriichi's corpse for his DNA, but as he needed to become stronger, it couldn't be helped.
In the era of war where everyone fought for sovereignty, Yoriichi was born, becoming the strongest warrior in all, but instead of fighting against other warriors, he fought the demon.
Then, if Yoriichi fought another human, then what would happen?
It was a complete massacre.
Moreover, there were also various DNAs, techniques, blessings of the goddess, and many others on his body.
Everything moved in slow motion; each of his senses could notice how all of them would react, leading him to the best courses, and his limbs moved to either cut one of the limbs or smash the body or face of his opponents.
In that moment, no one could react, watching this hell-like scenery, all of them could only stun in a daze.
"It hurts!"
"My leg! My leg!"
"No! Help me! I don't want to be killed!"
"What is this... what is this..." Daphne muttered, feeling frightened by everyone's screams.
"Ah... it's him... it's him..." Cassandra, who had squatted down, lay motionlessly on the ground and looked at Isao's neck. On his neck, the mark of a red spider lily and centipede glow in an ominous light, bringing a nightmare to everyone in the Apollo Familia.
"I have told you to surrender before..."
Yet, her mutter was ignored as everyone was too focused on running away.
Hyakinthos was also startled, but watching all of his comrades who lost their limbs or passed out after broken bones on their faces or bodies, he quickly shouted, "ATTACK HIM! ATTACK HIM! ATTACK WITH ALL OF YOUR MIGHT!"
"We will hit the others!"
"It doesn't matter! We can't let him go on like this! Attack them all together!"
While hesitating, they followed Hyakinthos' words. Frankly, the comrades on the Apollo Familia were nonexistent, especially when most of the members were forced to join, and each of them hated the other.
As for Hyakinthos, he thought of them as nothing but pawns for him and Apollo to use!
So, at that moment, everyone used their magic to bombard Isao to death!
BOOOM! BOOOM! BOOM!
"What are you doing, Hyakinthos?!" Daphne looked at Hyankinthos angrily, but he ignored her, letting everyone use all of their magic to rain down the place where Isao was.
Yes, they might hit their comrades and hurt them, but as long as Isao was defeated, it was all worth it!
"What are you doing, Hyakinthos?!"
"Don't attack us!"
"No! Stop it!"
Everyone who was attacked by the magic was startled, and all of them screamed, begging them to stop, but it was impossible; in the area where Isao stayed, everyone focused their magic, giving their everything, creating a large explosion and flame that burnt in every direction.
Everyone remembered the horror and terror given by Isao, and they tried to erase their fears by using their magic to attack him.
It wasn't until they lost all of their stamina and were unable to use their magic that they plopped on the ground, sighing in relief, thinking that Isao was as good as over. While there were some sacrifices, it was all worth it when they thought that he was defeated.
Only when the smoke disappeared did they see him standing still.
"No-No way..."
"What is he?! What the hell is he?!"
"M-Monster! He is a monster!"
Isao ignored them and looked at his two weapons, which were broken into pieces. He wasn't surprised since he knew that they were on the limit as he had used them for so many years. Moreover, he even brought them to the dungeon, killing various monsters, and while they were strong, they had a limit.
Yet, he had to say, he felt emotional when he lost those two weapons as they had accompanied him for so long.
"His weapons are broken! Attack him at the same time! Attack!"
Hyakinthos quickly made an order, and everyone started to attack him together.
"ATTACK!"
"Don't let him go!"
"Let me repay for what he had done to all of our comrades!"
The last one was quite shameless, Isao thought.
Still, even with so many people approaching him at the same time, Isao didn't fear them and even approached them on his own initiative.
"Huh?!"
The one that was targeted by Isao was startled, but before he was able to do anything, his nose was broken and sunk deep into his face.
Crack!
Yet, he wasn't the only one, as the sound of breaking bones echoed throughout the battlefield.
This was a cruel scene; everyone was in fear, watching how Isao brutally beat all of them without a single mercy with his two fists!
"Lay down! If you lay down and admit a defeat, he won't beat you!" Cassandra couldn't bear all of her Familia members being taken down by Isao cruelly, so she shouted, causing a domino effect where many of them lay down, giving up.
As expected, Isao didn't do anything to those who laid down and gave up.
Those who laid down sighed in relief, but those who still stood up trembling, wondering what they should do.
"You coward?! How can you face you Apollo-sama that way?!" Hyakinthos was in a panic when many of them lay down, burying their faces deeply into the soil and showing their submission to Isao.
While some of them wanted to fight, they quickly stopped their thoughts when Isao took out two weapons that he had placed on his suspenders.
Unlike before, an ancient-like script with blood and violet gleamed on his new one-handed poleaxe and saber.
The two weapons were gifts from Hestia, something given to him by begging Hephaestus.
Still, there was no doubt that there was something hidden behind their transactions, but he decided to keep quiet and also felt satisfied with his new weapons.
Living weapons.
His weapons were living things as they grew stronger as he grew.
They might be weak now, but as he kept using them and getting stronger, they would also become stronger.
As he held two new weapons, an ear, arm, leg, or wound on the opponent's chest kept appearing one after another, causing those who had a fighting spirit to quickly give up and lay down.
Daphne thought about fighting, but when his eyes glared in her direction, her legs were weak; feeling that death was approaching, Cassandra quickly pulled her down, causing her to sigh in relief as she panted in fear.
On the other hand, Hyakinthos couldn't stay calm as Isao's eyes were on him. He quickly pissed on himself and shouted with all of his might, "I GIVE UP! I GIVE UP! YOU WIN! YOU WIN!"
His mind was distorted due to fear, watching all of the members of the Apollo Familia lay on the ground, holding their dismembered limbs or injuries due to Isao.
"It hurts... it hurts..."
"I give up... I give up..."
"No... please stop..."
Nevertheless, with all of that, the War Game ended with the victory of Isao, who stood among all the cries of the fallen that lay on the blood-soaked soil.
On the other hand, those who watched the War Game could only be stunned silly, watching the massacre before them. Hundreds of people were defeated by a single young man.
Hestia bit her lower lip and her eyes were moist due to tears, feeling angry by Apollo, who had forced Isao to do this.
"Apollo..."
Apollo, who was in a daze watching the massacre of his children, was startled by Hestia's voice.
"He-Hestia..."
"You are ready for what comes next, right?
"W-Wait... I didn't really mean it... Moreover, my... my children are already hurt like that..."
Yet, Hestia didn't show mercy. "Shut up! If you didn't force him, then would everything become like this?! You promised to give me anything I wanted if I won, right?"
"Hii...!"
"All of your property is confiscated! Your Familia is split up! You're eternally banished! Never set a foot on the Orario!"
"HIIII.....!"
"THE BATTLE IS OVER! THE WINNER IS HESTIA FAMILIA!"
While some screamed excitedly at the bloody scene, some had a complicated gaze.
Still, as the victory was determined, there was no need for the War Game anymore.
"DIEEEEEE!!!!"
Only Hyakinthos stared at the back of Isao, and his breathing became heavy. Then, without hesitation, he suddenly dashed and stabbed Isao's heart.
"..."
Everyone was at a loss, watching all of this.
Hestia was even more so. "APOLLOOOOOOOOO!!!!" Her divine aura subconsciously released, causing everyone to be startled, but she wasn't the only one as many quickly lost their control when they saw Isao was stabbed, but—
"I killed him! Yeah! I won! I wo—"
Hyakinthos' head suddenly fell to the ground and died.
Isao swung his saber at ease, stood stall, ignoring his wounds, and then took out a high-quality potion to heal his body. "Even though I have given you a chance." He shook his head, then looked at Daphne and Cassandra, who were startled by his gaze. "You two join my Familia later."
"..." 2x
Could they refuse?
"Ah, um." 2x
Demon, killer, monster, hero, devil, or even god.
Watching his cruelty, everyone had their own thoughts regarding him.
Some were in fear, some were disgusted, some were in love, and some even worshipped him.
However, whatever impression they had on him, the name of Iinuma Isao would be remembered by everyone in the Orario and even the world.