Path to redemption: A Tankana betrayed au

Prologue

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Another Tankana au by me AmazonZoo. Hope you enjoy! Again any fan arts in the story don't belong to me as I have no talent. Credits to the owners.
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In the office of the principal of the popular school Kimetsu high school, Kagaya Ubuyashiki was doing some work on his computer.

Suddenly the door busted open and in came someone wearing a coat, hat and mask covering his face.

Kagaya looked at the figure in shock and looked closely at his eyes noticing the cat eyes. His eyes widened in realization. (A/N:The disease hasn't reached his eyes yet so he can see)

"You're a demon!", he yelled. As the demon started slowly walking towards him, Kagaya pressed a button under his desk.

He got up from his chair and looked at the demon dead in the eyes. "What do you want demon?", He calmly asked.

The demon said nothing. It only smirked and it's eyes started glowing blue. "Time for your strongest slayers to go", was what the demon said as a spike grew from it's arm and it stabbed Kagaya in the arm making him fall to the ground.

The demon kicked him in the gut and then took something out of it's pocket.

Before Kagaya lost consciousness he say the demon take out to pieces of cloth and hair. He noticed one of the cloth had a checkered pattern like Tanjiro's haori. Everything then went black.
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"That was a pretty easy mission right Kanao?"

"Yes it was Tanjiro"

Tanjiro and Kanao were coming back from a mission they were sent on a few hours ago and now all they want is some rest. Inosuke and Zenitsu were sent on a different mission.

"I wonder why the Hashiras texted us to meet them at the gym", Tanjiro said as Kanao hummed in response.

Soon they finally arrived at the gym and when they entered the sight they saw shocked them both.

Nezuko was tied up and was being held down by Sanemi whilst all the Hashira noticed them.

"YOU!", Iguro yelled as he took out his sword and charged at the two teenagers but was stopped by Rengoku.

"HOW DARE YOU!", Iguro yelled as he tried to free himself, "HOW DARE YOU TWO TRY TO KILL OYAKATA-SAMA!"

"Wait....WHAT!?", Tanjiro and Kanao yelled at the same time.

Tanjiro was about to say something but stopped when Sanemi took out his sword and pointed it at Nezuko's neck. Tanjiro looked at him shocked.

"Sanemi what are you- Slash NOOOOO!!!!!", He yelled when Sanemi decapitated Nezuko and she was now disappearing in ash.

"I-I'm s-sorry Onii-chan....", Was the last thing she said as she disappeared completely.

"N-Nezuko n-no!", Tanjiro shouted as he ran to her ashes but then received a kick to the chest by Sanemi.

The kick was so hard that he ended up coughing out blood. A worried Kanao ran up to Tanjiro and tried to help him.

"W-why did you do that Sanemi-san, Nee-san I-", Kanao was cut off when Shinobu slapped her hard across the cheek.

"Don't you dare call me that traitor!", Shinobu warned in rage, "I honestly don't know why Kanae adopted a murderer like you"

Kanao's eyes widened in shock. She touched her bruised cheek and then at Shinobu with tears in her eyes. "What-", "Oh don't even try to lie Kanao", Shinobu cut her off, "I can't believe you and Tanjiro tried to poison and kill master!"