Animeverse Slayer!

Seeing Upper Moon One a bead of sweat trickled down Rengoku's cheeks. He felt pressured.

If it was any other demons he wouldn't be this startled, but Upper Moon One was different. He was a demon closest to Muzan in terms of strength and records show zero slayers being alive after they met him.

Upper Moon One stared at Upper Moon Three, "You couldn't even handle a single Hashira?"

"Shut up!"

Upper Moon Three gnashed his teeth.

His recovery has for some reason slowed down so he was still missing an arm.

Upper Moon One turned his gaze and spoke, "The Flame Hashira... you are an outstanding individual. That's why I will give you a choice."

He raised his arm and sliced it with his other arm, blood flowed down, "Accept my blood and join us. Or just die."

Rengoku raised his head, "Join you? Join demons that lurk beneath the dark?"

Upper Moon One asked indifferently, "You find it unacceptable? Atleast it's better than dying."

Rengoku suddenly burst out laughing, he raised his sword, "I am glad to die for what I believe in, that way I will light the path for future generations!"

Upper Moon One took back his hand and raised his sword, "So you have made your choice, such a shame."

Rengoku's eyes turned sharp, this battle might kill him but he didn't plan to step back. If he dies, then so be it. Atleast he will go out with a bang.

He focused on his opponent only to lose sight of him. His sharp senses caught movement beside him. Rengoku raised his sword and blocked his right side.

A strong force struck his sword and made his stumble. His eyes caught Upper Moon One.

Breath Of Moon Third Form, Loathsome Moon.

Two crescent shaped blade attacks flashed towards Rengoku. Between these crescent shaped blade forms were innumerable smaller ones.

Rengoku was forced to retreat.

Breath Of Flames Fifth Form, Flickering Flames!

Rengoku was engulfed by a flickering flame. The Crescent shaped attacks submerged into the flames. A second later the flame burst out, Rengoku spat out blood and retreated.

Upper Moon One didn't plan to let him go. He slashed down.

Breath Of Moon Sixteenth Form, Half Moon.

Crescent shaped moon followed his attack and blocked Rengoku from every direction. Unable to retreat any further Rengoku steeled his heart.

Breath Of Flames Eight Form, Flame Storm!

His sword moved irregularly and created a flame storm around him. The crescent slashes collided with the storm, the storm lasted for a second before it was torn apart.

Rengoku was torn in between these slashes. He kneeled down and vomited blood.

"Rengoku-san!!"

Tanjiro and the rest caught up. They immediately attacked Upper Moon One.

"You kids are also outstanding, such a shame we stand on opposite sides."

Upper Moon One had an indifferent tone as he spoke, he slashed towards the trio.

Crescent slashes covered all three of them from all sides.

Breath Of Lighting First Form, Thunderclap and Flash, Eight fold!

Breath Of Beast Eighth Fang, Explosive Rush!

Dance Of The Fire God, Dragon Sun Halo Head Dance!

Though their attacks were strong it still paled in comparison to Upper Moon One's. They were injured, but the crescent attacks were destroyed as well.

Upper Moon One was startled. He gazed at Tanjiro while his sword stuck the other two.

Inosuke and Zenitsu failed to react in time. They were both slashed and coughed up blood. Their bodies fell down powerlessly.

"Inosuke! Zenitsu!"

Tanjiro yelled at them but got no reaction.

Upper Moon One spoke, "You use the same techniques as my brother."

What?

Tanjiro was shocked.

Upper Moon One suddenly raised his sword, "Those techniques bring back some memories I don't want to recall. So, die."

Breath Of Moon Eighth Form, Moon Dragon Ringtail.

A single crescent shaped slash several times stronger than the ones before assaulted Tanjiro.

Blood pumped through Tanjiro's body like never before, he knew if he couldn't block this attack he would die.

Dance Of The Fire God, Raging Sun!

Tanjiro unleashed two horizontal slashes that defended him.

The crescent slash collided with Tanjiro's raging sun, it held up for a single second before collapsing. Tanjiro forced his body to move. He barely avoided getting cleaved into two by placing his sword on his c.h.e.s.t.

Looking at his broken sword and his open c.h.e.s.t with a large wound Tanjiro found it hard to breath.

Upper Moon One raised his sword again, however he raised an eyebrow and slashed to his back.

Clang!

Rengoku at some point got close to Upper Moon One and struck him.

"You are on your last breath, why bother?"

Upper Moon One kicked him away. Rengoku spat out blood, he couldn't breath. His lungs were ruptured, each breath only caused him to cough out more blood.

"Take care of the other two."

Upper Moon One said without turning his head. Upper Moon Three who was still healing from his wounds ground his teeth, but he still accepted what he was told.

Upper Moon One stood before Rengoku, "You are a great warrior, for that reason I will give you a swift death."

His sword was raised, Tanjiro could only gasp and tried to move, but his body felt as if it was made of lead. The slightest movement took him everything he had.

However what he expected didn't happen. Upper Moon One still had his sword raised, Upper Moon Three stood stiffly before Inosuke and Zenitsu, but they didn't move.

What's happening?

Just as he was wondering what was happening a voice he knew so well rang out.

"Go ahead, try it."

Tanjiro's eyes turned towards the owner of that voice. His eyes misted when he saw who it was.

From the woods behind them a figure slowly stepped out. His piercing blue eyes resembled an icy abyss, his aura was fully released and fell on them like a great mountain.

Leo slowly stepped out, raging murderous intent poured out of him as he repeated.

"Go ahead, try it."