Mystic Demon Slayer

Gray clouds, lines and points all over the world and every object even the clouds had lines in them it felt as if the world will get destroyed at any second, just for a second fear rose in Zenitsu's heart as he couldn't help but think of what he learned in the root before he came as he couldn't help but look around and utter softly

"This world… is too frail… Everything can die even…even the world itself...so this is death huh"

Just as he finished his phrase it appeared that his brain couldn't handle the load anymore as he lost consciousness as a self-defense mechanism, but he got caught by his master who looked visibly shaken

Looking at the kid in his hands Jigoro's eyes were full of shock and a bit of fear that quickly disappeared 'Those eyes… what are they… I have never felt so close to death, it felt as if I was going to die at any moment, and those words he said before he lost consciousness what does he mean by them' holding Zenitsu as he ran home he couldn't help but think as he looked with affection at the kid in his arm 'i hope its a good thing for him, maybe its some sort of power… it doesn't matter as long as it can help him'

"It appears that the training schedule will get more charged hahaahaahah"

* * *

'Ughh...What happened, I just killed the demon as suddenly the world changed it appeared frail…killable…but it appears that my brain couldn't handle the load, that was dangerous, I need to control it if it is to appear every time I killed a demon or something… huh what's this...' Suddenly he discovered some information in his head more precisely a name

"Mystic eyes of death perception…"

"So that's what the eyes are called?"

Hearing the voice next to him Zenitsu couldn't help but get shocked as his eyes snapped open looking around him noticing it was his master he closed his eyes again as he just noticed the lines again

Looking at the actions of his disciple his expression became serious 'that feeling again.. death and the name of the eyes, let's see if they are trainable or not, hope they are or losing vision will cause his path as a demon hunter to cease here'

"Zenitsu what's with your eyes do you feel any discomfort ?"

Hesitating a bit Zenitsu didn't know if he should tell the truth or just bullshit his way out of it, but that would be suspicious and his master won't do any harm to him and probably would help him out in figuring out how it works, so with this thought in mind Zenitsu decided to talk to him honestly about his powers

"No, it's just that if I open them for a long time my brain won't be able to handle it..."

"Is there a change in your vision? Any sort of power?"

"Yes, its…."

* * *

{7 Days latter}

Zenitsu can be seen standing in front of a metal slab with line on top of it holding a kitchen knife in his hand, looking at it his eyes transformed from its golden to blue with rainbow colors around the pupil following that he slashed the air in front of him slowly as the metal slab got cut in two but it was far from the line marked on it, breathing lightly he looked at his master who was observing all of this

"Indeed the eyes power ignore any and everything as long as you cut along those lines… but it appears you have no control on where to cut"

"Yes gramps"

"So from what we gathered this week is that as long as you can along the lines whoever and whatever in the other side is done for, and if you stab the points they cease to exist, but you can't open your eyes for long as it puts a great toll on you

Okay let's go back to training we need to change a lot, you will need to learn how to focus on only what you need to cut as it appears when you open them you see lines everywhere you need to learn to only see lines where you want to

Also, that would probably help you a lot in terms of opening them for a longer period, also you need to train to make it open for a longer time by just forcing yourself to without damaging your brain, of course, as of now the time you can open it for, is almost useless in a fight…

Oh, I almost forgot I remember you telling me about this breathing technique you were making it appears you almost finished it, how about we model It based on the eyes that would make you way stronger if everything goes as planned… it's your technique tho thing about it"

Thinking about the options Zenitsu noded his head

"Yes Gramps, we'll go with what you said I don't see anything wrong with it, oh right I wanted to try to use the technique for a long time but my lungs couldn't handle it do have any idea how to train it?"

"Actually yes, using a breathing technique for 24/7 is kinda required from the higher demon hunters so there is a lot of ways to get it stronger… , but let's take things slowly we'll give every one of them a portion of time and make the training complement each other, I am going to make a schedule you can go rest for today"

"Oh, okay gramps..."

Following that Jigoro just walked away as he appeared in deep thought probably thinking of ways to torture Zenitsu, looking at the retreating back Zenitsu just smiled a bit depressed

'If I knew he would be this helpful with techniques I would have asked him long ago, he sure is experienced, even though I was in war in my previous life I died young I can't compare to him in experience and breathing techniques...'

'Sighhh… ill just relax today tomorrow will probably be hell:'

* * * Author Note * * *

My decision in this chapter may not be welcomed by some of you, but I chose to do so as in this world (Demon Slayer) Humans aren't exactly enemies, so telling secrets and such won't get you hunted down… if it was in Naruto I would have probably made him more alert and let's not forget that the one he talked to was his master/gramps who 'raised him' don't forget that Zenitsu's original memories are his now even though none of his personality passed

Well, this is my decision and I won't change it, hope you liked the chapter :)