Author's Note: So, I have thought this over and I have decided to extend this story. I will be following the events of the aftermath of the Mugen Train Arc and going through the Entertainment District Arc. I was not planning to do anything with Rengoku's demon power but I guess I am! So, I am going to make a few changes to these chapters I already wrote but everything will be the same. I hope you all continue to enjoy this story! Once again, I do not own anything.


Chapter 1


What happened? What was going on? One minute he was running with sword in hand to go save Kyojuro Rengoku and the next he was back on the ground. Tanjiro got up, using his arms to hold him up. He looked up to see the Upper Rank Three demon Akaza and Kyojuro Rengoku, the Flame Hashira, standing feet apart from each other.

"Mr. Rengoku..." Tanjiro froze. His scent. The Flame Hashira's scent was familiar and yet different all the same.

"Well, Kyojuro, how do you feel?" Akaza asked Kyojuro.

"How dare you... How dare you turn me into a demon without my approval!" Kyojuro screamed at him, his sword in hand, ready to continue the fight with the Upper Rank demon.

Tanjiro froze once again. Mr. Rengoku... Is a demon!?

"Well, now that your wounds have healed and you're much stronger now, why don't you join us." Akaza offered.

"No. I would never betray the Demon Slayer Corp! I have a mission and I will see it fulfilled!" Kyojuro replied.

With his great speed, Kyojuro went to slash at Akaza but Akaza leaped out of the way. He landed a few feet away from Kyojuro.

"I would like to fight with you longer, but the sun is rising." Akaza said, smiling slyly. "I can't wait to see how you will act as a true demon." With that, Akaza ran off into the darkness of the forest.

Tanjiro was now on his feet. He overheard what Akaza had said and a realization dawned on him. Rengoku. He's a demon! He can't be in the sun anymore!

Despite being injured and exhausted, Tanjiro ran towards Kyojuro. "Rengoku!"

Kyojuro turned to look at Tanjiro who has now reached him and is leaning over, out of breath. "You need to stay away from the sun. It will hurt you now."

"Indeed, young Kamado." Kyojuro said, understanding. He and Tanjiro stood under the shade of the trees. They watched on as Inosuke and Zenitsu helped the passengers get out of the train safely. Soon, Inosuke joined them while Zenitsu went to get Nezuko who he safely put inside her box.

"So, you're a demon now." Tanjiro said, looking up at Rengoku.

"Yes, that is correct. The Upper Rank Three turned me into a demon in the middle of battle without me knowing. Even I didn't see that coming." Kyojuro replied.

"Will the other Hashiras still accept you as part of the Demon Slayer Corp?" Tanjiro asked.

"That depends on their decision. They will most likely want to test me to see if I will hurt a human." Kyojuro replied.

Tanjiro thought this over for a moment but then his eyes rose to see the Kakushi arrive. "What should we tell them?" Tanjiro asked Rengoku, not taking his eyes off the incoming Kakushi.

Kyojuro turned to watch the Kakushi as well. "Tell them we will be traveling back by nightfall. They can take care of the passengers."

"So, Bug-Eyes is a demon huh." Inosuke spoke up. Tanjiro turned to look his way.

"Yeah." Tanjiro said though he feels guilty. First his sister is a demon, now the person he is now looking up to is also a demon. Did he fail twice?