In this timeline shido was just shido not a reincarnation of shinji.
so when tengu fire happened it never was Kotori who caused it which in turn killed Kotori
The spirits never existed because mio never existed
when shido was found he had scaring o...
We see a brown,pink and white cat making her way through the air ducts and dodging laser sensors all while humming the mission impossible theme then when she reaches a really high drop she activates her collar as the backpack she's wearing opens up as a grappling hook shoots out wedging into a metal wall
Neo(mind):I really miss having opposable thumbs It took me six months to make this out of scraps from junkyards.
Soon enough she jumps as she begins free falling as she lands at the bottom floor where she looks through a air duct were she finds nia being experimented on.
Neo(mind):these welps are going to get the SHOCK of their lives soon enough for hurting nia darling
Neo soon activates her collar again as retractable scrap metal gloves comes over her paws as she jumps and busts the grate open and lunges at the scientists and guards electrocuting them and bashing their heads in as they slump over either dead or unconscious.
Neo would then use a key card to open the door as she begins pulling wires and tubing out of nia as she then slumps over
Neo(mind)(in a young moon butterfly voice):oh no I killed her
Nia's body would then roll onto her back as she then jumps up on her feet and transforms
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Nia:woo its good to be back thanks Neopolitain
Neo would then point at herself and then at her mouth initiating she can't speak
Nia:oh right you need magic
Neo would then shake her head and make a "uh durrr" face
Nia would then kneel down and extends her hand to neo which neo graciously accept and connects her magic to her
Nia would then pick up neo as she places her on her shoulder as she then goes over to her neck and destroys the realizer in their after that she begins destroying the dem tech and starts to reconfigure it to match her own while also cursing said tech as she yells out all the flaws and stupidity of the dem
Nia:MOST ADVANCED TECHNOLOGY MY ASS,ALL OF THIS STUFF ARE JUST PROTOTYPES OF PROTOTYPES OF MY FIRST CREATIONS.I MEAN SERIOUSLY YOU GUYS CAN'T CREATE A SIMPLE MANA REACTOR AND JUST USE A TYPE OF BATTERY INSTEAD,AND DONT EVEN GET ME STARTED ON THE LOUSY ENERGY OUTPUT SERIOUSLY WHAT IS THIS PRESCHOOL.
After nia is done she has replicated and incorporated nanites and nanotech into her body and astral dress(kind of like origami in season 4)
Nia:ah much better I'm starting to feel like my old self again.
Suddenly the door is busted down by dem soldiers as they yell out "freeze
Nia:seriously freeze you guys are so cliche
Nia would then use her nano tech to start playing music in her head
Nia:you ready for this Neo?
Neo"head nod"
Nia and Neo would charge forward taking out DEM soldiers
Meanwhile with shido
Shido:well either way Neo and Nia can take of themselves
Soon shido makes it to his class as he is about to sit down as then suddenly someone calls him out
Ai(serious):hey leader
Shido(serious):inferno storm
As a stare down suddenly ensues between them as the whole class is intimidated by them
Mii(scared):do they know each other
Mai(terrified):I don't know maybe
Shido(hands in the air):AI!!!!!!
Ai(hands up near her chest):shi-do
Class(wtf face):huh
Soon Shido and Ai run up to each other and start playing a weird game of patty cake
Mai:what am I watching
Mii:the lamest game of patty cake?
Suddenly shido punches Ai as Ai laughs it off and then punches shido as they both start laughing
Shido:aw man I almost thought you would've gone soft on me
Ai:you still got it
Next shido and ai grab a desk and are about to start arm wrestling
Shido:ready?
Ai:go!!!
Soon shido and ai begin arm wrestling
Mai(still confused but somewhat excited):um don't lose Ai
Mii(same a mai):yeah don't lose to this lame~o
Shido and Ai are going at as then suddenly the rest of the class hears creaking and groaning sounds as then the desk suddenly breaks and shatters as shido and Ai fall as they both let go
Shido:........
Ai:.......
Ai:alright we'll call it a draw
Shido:agreed
Soon miss Tamae enters the classroom
Miss Tamae:um can someone explain to me why a desk is broken
Shido:I dont know it was just like this when we got here
Ai:yes that is correct right everyone?
Rest of class(murmurs):yes,right,truly no mistake
Miss Tamae:well then alright I will call someone to take broken desk out of here but before anything else I am your teacher for this year please everyone take a seat and then we'll begin class
Shido(German)(whisper):so Ai did you happen to run into anyone of the guardians hero's?
Ai(German)(whisper):no also I've been meaning to ask why the hell are we back in time to the beginning of our highschool?
Shido(German)(whisperl:long story short me and kurumi were tricked into a contract that gave up our own afterlife serving as counter guardians for several thousand millennia until we and 8 more counter guardians broke free and essentially reset our time lines
Ai(German)(whisper):only you two would do something so reckless and so utterly stupid.
Shido(German)(whisper):well at least you have a second chance to ask out that boy you liked
Ai(German)(whisper)(smug):yes thats true also wouldn't this be a perfect chance to mend your lovey-dovey relationship with origami?
Origami hearing this would begin choking hearing what Ai said
Miss Tamae:are you ok?
Origami(pounding her chest)(coughing):yes swallowed something and it went down the wrong tube
Shido(German)(whisper):can she understand us
Ai(German)(whisper):most likely lets talk later
Origami(mind):did I hear them correctly they're from the future and I had a lovey-dovey relationship with shido? This is a dream come true but Ai said mend our relationship does that mean something happened between us that made us leave each other? I'll find out later