First mission
"Now that you have become a demon slayers there are a few things I want to tell you the demon slayer corp uniforms you are wearing right now is made out of a special fiber that is fire and water resistant whilst also being light weight also low level demons cannot penetrate it" urodaki told the boys
"Damn that's strong" Haruto said as he got an angry look from tanjiro
"Impressive right now as for the nichirin sword it's color varies from owner to owner and each hue has its different traits however there aren't many demon slayers with black blades some believe their a bad omen" urodaki says
"A bad omen how do" tanjiro asked the sagely man
"It's said they are wielded by swordsman who have little chance of going far" urodaki said which he could tell visibly ticked Haruto off
"I don't care if I'm destined to not be great my only priority is to turn nezuko back human and keep her safe" tanjiro said which slightly worried Haruto
"Here a box to carry your sister during the day" urodaki said as he handed tanjiro the box
"Wow this is light" tanjiro said as he picked up the box
"Nezuko hop in pretty please" tanjiro says as nezuko gets on the box
Outside
"Alright we're off" tanjiro said just to be stopped by urodaki to straighten their looks out
A/N the look is finally complete now he looks exactly like he did in the picture
They start heading off
At the town
"What do you say we go get something to eat tanjiro" Haruto asked tanjiro
"Yeah I'm kinda hungry" tanjiro said as Haruto led him to a ramen shop and see Kazumi just aimlessly walking as they hear the whispers
And stop Kazumi to find out where the girl disappeared
"Uh this scent is repulsive" Haruto said as tanjiro agreed
Sundown
"You gotta believe me she just disappeared" KazuMi said
"We do believe you we are demon slayers but you can't tell anyone" Haruto said as he look back at Kazumi
"But I thought you were just myths" Kazumi said as he looked at them in awe
Nighttime
"Shouldn't you rest" Kazumi asked
"No" Haruto said "demons are only active at night" he added
"I got the scent" Haruto says as he pinpointed the location "follow me" Haruto added onto that
They ran to a big house and got their to see a little girl being followed by soMething black on the ground
They followed the girl into her bedroom and saw a demon stick it's arms out so they decided this was the time
Tanjiro cut its arms off and saves the girl as the demon jumps out of the puddle revealing its 3 different demons
"What the hell why are there 3 of you" tanjiro asked while handing the boy the girl
"Because it's easier to ki-" the demon almost finished what he was saying when his head fell to the ground and he saw Harutos back
As the demon died the other 2 rushed Haruto out of anger as they both tried to slash him with their claws and he cut their arms off.
Once they had regained their senses they went back down in the puddle dragging Haruto down with them into the swamp.
Haruto watched as they circled him and as they were about to attack a realization hit him
'Water breathing 6th form: whirlpool' as Haruto thought this the demons rushed towards him as he let the attack out slicing both of the demons into pieces
As Haruto swam up and got out of the swamp he saw Kazumi hugging tanjiro which made him oddly jealous
"Hey you can stop now their dead" Haruto said as he looked Kazumi in the eyes
"Y-yeah but did you manage to save her" Kazumi asked hopefully
"No" Haruto said almost coldly as he could feel the person sink into sorrow
"Tanjiro I think its time we leave" Haruto said as he and tanjiro just vanished