Animeverse Slayer!

Leo stared at this disgusting demon. The other Hashiras also saw this particular demon and rushed towards it.

However just as they neared it several doors suddenly appeared out of nowhere and trapped Leo and the monster inside like a box.

Gyomei was the first to act, his weapon, an axe with a long thick chain connected to an iron ball stretched out of his hand and slammed into the doors.

However the doors remained intact and only trembled slightly. Just as the others were about to prepare for their own attack the doors disappeared along with Leo and the monster.

"Shit!"

Sanemi cursed.

"Get ready, our opponents are here."

Gyomei stared off into the distance. His white eyes stared deeply into the darkness of the Infinity Fortress.

Several more doors popped up. From them emerged five demons.

All of them radiated immense strength. Their eyes were engraved with their corresponding number.

Leading them was a man with long hair and six pairs of eyes, he had a sword on his waist.

Upper Moon One.

A pale young man wearing dark and red clothes, his hair was partially dyed with a bloody colour.

Upper Moon Two.

A young man with short hair and tattoos all over his body.

Upper Moon Three.

A lady wearing revealing purple clothes with purple snake patterns on her body.

Upper Moon Five.

A young man wearing demon slayer clothes with a sword in his hand.

Upper Moon Six.

Zenitsu's eyes shrunk when he saw Upper Moon Six. Unknowingly his aura started to leak out.

"Calm your mind Zenitsu."

Just as his rage was about to take over Gyomei's serene voice woke him up.

"I know."

Gyomei nodded. A crow flew towards them and dropped a stack of papers. Gyomei and the rest grabbed one and stepped towards Upper Moon One. Rengoku, Tokito and Sanemi followed him.

Shinobu, Kanae, Inosuke and Kanao rushed towards Upper Moon Two.

Giyu, Sabito, Tanjiro and Makomo took on Upper Moon Three.

Uzui, Iguro and Kanroji took on Upper Moon Five.

And finally Zenitsu stepped towards Upper Moon Six.

Tanjiro wanted to speak but Zenitsu cut him off.

"This is something I must do alone."

Tanjiro nodded and said, "Be careful."

All of them disappeared as they followed their opponents.

Only Zenitsu and Upper Moon Six remained.

"Who would have thought?"

Upper Moon Six spoke.

Zenitsu stared at him and said, "That you would become a demon?"

Upper Moon Six shrugged, "It seemed like a good choice. I am stronger now than ever."

Zenitsu stared at him for a while and asked, "Why?"

Upper Moon Six looked at him with derision, "Why do we train Zenitsu, to get stronger. A path was shown to me to become stronger, and I took it."

Zenitsu couldn't accept that answer, he yelled at him, "Just for that!? Did you not think about master? You were his successor!"

Upper Moon Six showed an indifferent expression, "Being his successor doesn't make me strong. That day I fought against Upper Moon One, I realized then that humans were pitifully weak."

"Muzan-sama could have obliterated the Slayer Corps at any time but he didn't. Know why? Because they weren't worth his time."

"No matter how much we train we are inferior to demons, we get strong only to grow weak as we age. Since I can grow stronger and live indefinitely, why not?"

Zenitsu clenched his fist, "Master... master treated us like his family. Do you know... he did harakiri. But no one was there to cut off his head. He bled like a nobody for hours, he suffered for hours before he died!"

"So?"

Zenitsu was trembling from rage, however suddenly he calmed down. His boiling emotions vanished like a puff of smoke.

He stared at his senior brother and said, "You became a demon to live longer and to get stronger, right?"

Hm?

Upper Moon Six frowned. He felt uncomfortable when he was stared at by Zenitsu. For some reason he was feeling uneasy.

Zenitsu placed his hand on his sword, "Then... if I kill you in an instant would you feel regret?"

Upper Moon Six wanted to laugh when he heard Zenitsu but before he could he felt danger.

Instinctively he raised his sword but that danger suddenly disappeared.

"Why did you raise your sword, I didn't move. Were you scared?"

Zenitsu's calm voice echoed from behind. Upper Moon Six was frightened and turned around.

"How did you!?...

He turned serious. He knew his junior brother, he was a wimp, a coward, but he was frightened by this coward?

"Don't get c.o.c.ky!"

Upper Moon Six flashed towards Zenitsu, his sword was aiming for his heart.

Zenitsu stepped sideways and dodged. His body was covered in sparks as he dodged.

Upper Moon Six changed his sword slash and followed Zenitsu but now matter how fast he went he couldn't catch upto him.

What's happening? How can he dodge me?

Their figure kept dodging around the place. Lighting and thunder followed each of their movements.

As each second trickled by Upper Moon Six started to get worried.

This can't go on.

Thunder Breathing First Form Thunderclap And Flash!

Upper Moon Six flashed forward, he pierced through the air and reached Zenitsu in an instant.

Die!

His sword was piercing towards Zenitsu's throat.

Zenitsu saw the incoming attack and didn't panic. He thought back to those days when he trained a single form over and over again till he couldn't lift a finger.

His master, the former Thunder Hashira Jigoro Kuwajima never criticized him for his inability to learn other forms.

A few days ago he got message that his master died committing harakiri. He was lost, angry, sad... but one thing he was sure of, he wanted to kill his senior brother with his own hands.

"Zenitsu, Muzan will come for Nezuko. We are the one ones standing in his path to true immortality."

Leo spoke solemnly to Zenitsu.

"In this final battle his first target will be Oyakata-sama. You know the plan, however I don't want anyone else to be sacrificed."

Leo went silent for a second, "Amane-sama and her daughters... when the plan is set in motion I will get the girls, I need you to get Amane-sama."

Zenitsu hesitated and wanted to say something.

Leo patted his shoulder, "Elder Kuwajima saw something in you, he believed in you. You would shame him if you don't believe in yourself."

Zenitsu clenched his fist and agreed.

The plan worked as they imagined. Muzan never doubted a thing, he walked straight into their trap.

A split second before the explosion Leo and Zenitsu took action. Leo went for the girls while Zenitsu took Amane.

However he was still slow compared to Leo, when the flames were about to swallow him Zenitsu couldn't help but recall his master.

In that split second Zenitsu stepped beyond a boundary.

Watching his senior brother Zenitsu muttered under his breath.

Thunder Breathing Seventh Form, Honoikazuchi No Kami!