One shot adventure.

On the way back to the demon corps Nezuko is stolen off Tanjirous, back. And is hellbent on rescuing her. No matter the cost. Even if he has to fight Every. Last. Demon slayer. To do it…

It's had been 3 weeks since the time in the city of Kyoto a demon was spotted in the city to which Tanjirou, Inosuke. And Zenitsu. Were sent to kill. It turned out to be a priestess to a Shinto Shrine. And while not being an upper ranked demon. Only being a demon made from a upper demon that they were looking for leaving them mostly disappointed.

Heck it was so easy Zenitsu was able to take it out without even falling asleep, a story he continued to reveal in and tell the others long after it got old. As they began heading back to the Demon Slayer shrine up on the mountain.

"And then I was like-ZOOM! and she parried and tried to cut my head off with that fan of hers. but I was like "not today!" And flipped my sword around and parried before…" Zenitsu kept talking as Inosuke and Tanjirou sighed as Zenitsu was bouncing around animated as he recounted the events Inosuke Sighed and turned to Tanjirou

"You'd think after we told him he was more of a badass when he was asleep. He'd not be like this…" he muttered to Tanjirou who seemed just as fed up with his friends' antics. However remained cheerful.

"Leave him alone, Inosuke. Let him enjoy this moment." He said

The Bore man slayer turned to Tanjirou.

"Hey I agreed with you then but he's been doing this for 5 hours and I did more than he did and twice as much as you back there!" He shouted

"Umm guys?" Zenitsu asked as he realized they were not paying attention.

"Yeah well sorry for making sure Nezuko didn't go on a rampage again making a second demon more dangerous demon on you the entire time, next time I'll just leave you hanging then." Tanjirou said

Both Zenitsu and Inosuke froze. Tanjirou was mad, angry, as they looked at Tanjirou they noticed he looked so tired he would collapse in a second. Yet his muscles were seized up and tense ready to snap out at a moment's notice.

"Hey…" Zenitsu said as he stood infront of Tanjirou

"How's your sister doing?" He asked

Tanjirou glaired at Zenitsu which made him stumble back for a second before Tanjirou took a second to calm down.

"She's…we'll…she's getting worse… ever since her rampage in the entertainment district whenever she's out or even smells the smallest hint of blood she loses all control. Even my lullaby's are taking longer to take effect on her now…" he said

The three stood in tense silence, it was clear that Nezukos condition was causing a lot of stress on Tanjirou's mental health.

"Look once we get back the Demon slayer's summit we will have top of the line demon slayers try to stabilize her condition." Inosuke said

Zenitsu looked at Inosuke 'what happened to 'just wanting to get stronger?' He thought.

Inosuke was also in deep thought. 'I'm going to get in Tanjirou's way, he looks especially mad…'

Tanjirou sighed and put on his smile "yeah…yeah come on…the sooner we get back the better." He said

As they started walking Tanjirou noticed the box on his back was shaking Tanjirou though for a second that It was just his sisters weight but he noticed it was way to fast.

'Is she scared can she sense something?!' Tanjirou through his mind thinking at 100 miles a minute. He didn't realize he had stopped walking as he put his hand on Nezukos box.

Zenitsu turned around

"H-hey Tanjirou…what's up?" He asked

Tanjirou looked back at him.

"N-nothing… come on let's get-." Tanjirou started as he took a step

And from his side a creature zipped out of the tree line to his left he cut the left strap of Tanjirou's box. Before grabbing it and sliding it off his other arm fluidly and jumping back into the forest on the other side

"WHAT THE-?!" Inosuke gasped

"NEZUKO!" Tanjirou called as he ran to the forest and called for her

"NEZUKO!" He yelled but no response.

Tanjirou grit his teeth and growled he lost his sister… he was supposed to protect her She even tried to warn him and it resulted in nothing.

"Come on!" Tanjirou said as he started to make his way into the forest but the demon slayer Crow flew over.

"Report! Report! Demon slayers Tanjirou! Inosuke and Zenitsu are to report immediately to the Demon slayer shrine! Your late failure to report by one week will result in expulsion! Repeat demon slayers Tanjirou, Inosuke, And Zenitsu are to report to the Demon Slayer shrine immediately Priority one!" He cawed before he flew off.

Inosuke and Zenitsu looked at each other as Tanjirou grit his teeth harder.

"Damn it…" he hissed

Zenitsu stepped forward "come on Tanjirou… let's go." He said unsure if he was going to Aid Him in saving his sister or pull him away back to the shrine

Tanjirou snapped

"NO!" He said as he glaired at the two.

"You two head back to the shrine and give your report I'm going after Nezuko." He said

Inosuke and Zenitsu looked worried

"But Tanjirou…" Zenitsu said

"I'm not going without my sister!" He shouted

Inosuke stepped in front of him

"I'm the leader he so what I say goes! Priority one calls are not meant to be ignored for a reason. Your sister is Second compared to the mission or job now let's go!" He snapped as he tried to Drag Tanjirou away

He however didn't expect Tanjirou to draw his sword

"I didn't come to the demon slayers to fight some noble battle to defend humanity. I came to save my sister. So I don't care about the stupid code of conduct or other crap I'm going after Nezuko and you can't stop me." He said as he leveled his blade at Inosukes neck

"Are you threatening me?" Inosuke asked his voice leveled with steel.

"I will if I have to…" Tanjirou said equally tense

"Guys knock it off. I know we train with each other. But you know that drawing your sword on another member lethally can result in expulsions and it's guaranteed if you strike one!" Zenitsu called

"Shut it!" Tanjirou snapped as he drew his sword

"I've made my intentions clear. Now I'll say this one more time… stand. Aside." Tanjirou growled

However Inosuke didn't budge "…No." he said as he slowly drew his swords he didn't want to fight Tanjirou, but he had to make him see reason.

Tanjirou said nothing and lowered his stance.

Inosuke charged going for a swing "beast breath Second fang. SLICE!" he roared as he swing both blades as an X

The crow noticing the fight was happening immediately flew off to tell the leader of the inciting insurrection.

As the blades Hit Tanjirou vanished as Inosuke looked up to see Tanjirou falling towards him "water breathing Second form! water wheel!" He yelled as the wheel of water crashed into Inosuke as he raised his swords to parry the attack he was able to block the sword

However the water cut into his arm making him bleed and drop his second sword

"Damn it!" Inosuke hissed as he fell to his knees as Tanjirou used the opportunity to run into the forest

Zenitsu helped Inosuke up to ranted at him to go after Tanjirou but he shook his head

"It's no use…he's gone…" he said

Inosuke growled "Damn." He picked himself up as Zenitsu shouldered him and the two made their way to the shrine.

In the forest Tanjirou ran as fast as he could 'hang on Nezuko I'm coming…'

At the shrine:

Zenitsu and Inosuke made there way to the Shrine the HQ of the demon slayers. Where the Hashira were meeting with Their leader Kagaya Ubuyashiki also known as Oyakata-sama by the other Hashira. They were kneeling outside the open house while there master was sitting in the shade looking tense and worried

"Hmmm…things have escalated beyond our control…" he said as a crow landed in front of the Hashira.