We Open up in the middle of A Massive Battle that was Just outside of the Borders of the Grand Jura Forest, and the Jura-L/n Federation, and In this Massive Battle A Huge army of Elves vs A Huge Army of Demons from One of the Demon King's Army! 

While this Huge battle was going on, One of the Commanders was giving out orders to A Division of Undead Lancers, when he got shot through the Skull, knocking his skull off, and Killing him! That Arrow could be Traced back to The level Princess that Fired it from an amazing Distance!

This Elven Princess Was Named Filimos Harrifena, and in A Past life, she was Ms. Oka Otherwise known as Your Former Homeroom teacher, and she was leading her Team of Students, into A Battle against these Demons!

Filimos Harrifenas (Ms. Oka)

She was trying to get in contact with her Students Now Party members through Telepathy but they weren't contacting Back, and she was getting Scared, as she fired Magical Arrows at the Demon Horde!

Filimos: "Katia, Hugo, Anyone!? Are you there!? Hello!?" GAH!!"

Just then A Massive Demon attacked her from behind, and pinned her down, as it lifted its Axe Up!

Filimos: "Sigh. I guess I Failed to protect my students. I have failed as A Teacher..."

Demon: "Hahahaha! Prepare to Die!!"

???:

https://youtu.be/cdHp7I6pDdc

The demon was Knocked out cold before the Unknown figure blasted its Guts Out, and Filimos laid there to see you standing there smiling!

Y/n: "You Okay Princess?"

Filimos: "Y-Yes, But who are you?"

Y/n: "Heh, My Name is Y/n L/n, and I am the ruler of the Jura-L/n Federation."

Filimos then had A Face of shock as she realized who she was!

Filimos: 'Y/N!? Is in My Old student!? Holy Crap, So Many years and I finally found him!'

Just then you pulled out A Communication device and spoke into it as you helped Filimos Up!

Y/n: "Alright, everyone, attack now."

Just then Ranga appeared out of the Forest, and started generating an Electrical attack!

Ranga: "THUNDER CAGE!"

Just then Lightning fell from the sky, and it formed A Massive Cage that trapped the majority of the Demons inside of, and Then Souka, and Souei both showed up, and began using steel strings to began to tie up Multiple demons and then cut them like Saw Blades shooting blade everywhere! Just then The Kijin showed up and Began slicing down Even more Demons, Perona was making them feel Depressed, Milim ended up crushing even more, and Geld even went as far as to Crush them with his Earthquake Stomp, as Kazuma and Kazzie were slashing them down, Lina was Destroying them with the Dragon Slave, and even Malori was getting in there with some Flame Shower breath's That Vel taught her!

They all Quickly made short work out of all Of the Demons, and You walked into the Battlefield in front of the remaining demons to ask A Question!

Y/n: "Okay, who's the leader here?"

Just then A Monstrosity of only A Unholy nature appeared and it stared back at you with its Glowing eyes!

???: My Name is Modor and I am the Bastard Child of Loki, and Demon Lord! I shall destroy you for interfering with the demon king's Plans!"

Modor

Y/n: "Cool. Cool. And when they all ask if someone why you died, tell them... *Draws out sword* ... That the Great Y/n L/n had slain you, leaving nothing before."

Modor: "Ohohohoho! Quite confident aren't we? Loki's Curse!!"

Just then A Green Mist began to surround you, and Just then you were surrounded by the Illusion of your greatest Fears, and Regrets, and Just then Your Greatest Fear/Regret had appeared before you! You were back in your old Life, and The Class was being taught by Your favorite Teacher Ms. Oka, who was A Kind, Fun, and Generally Petite teacher, who was Whole Buckets of Fun, yet makes some really dated References!

Ms. Oka (Filimos' Past Life)

Ms. Oka: "Now everyone, Today I Have A Very Special Announcement! Just like Goku using Kaioken X4 For the first time *The Class internally groans* Today My favorite Student Y/n L/n was singlehandedly able to raise the funds needed, to Get us our first-ever class Trip to, Disney wold Tokyo!"

Everyone then Cheered as you then got up, and you walked over to the front Desk as Ms. Okay gave you A High five, and you were about to speak when you remembered what happened next!

https://youtu.be/6oe3kOz3j_w

A Massive explosion then engulfed the Classroom, killing everyone instantly except you! You were able to miraculously survive with no Injuries, and only some 3rd degree Burns! 

The Explosion Just came out of nowhere as it came from Space, and it Killed everyone leaving you A Suvivor! It was Ruled As A Terrorist Attack even though they couldn't find Any Bombs, or any suspects, and you had dealt with Suvviors guilt for A Little while but you eventually got past it, and it gave you the confidence to save that Loli even though it costed your own Life in the Process!

You were Just Laying there in the explosion, as You slowly got determined, and got up gritting your teeth!

Y/n: "No... You will Not... BEAT ME!! QUAKE QUAKE SHATTER!!"

https://youtu.be/Dbzlte_EaWQ

You then Thrust both of your arms around using Your Quake Quake spell, and you quickly shattered the illusion all around you, as you kept on gritting your teeth!

Everyone saw that and Was Terrified/Amazed depending on who they were and Filimos was thinking to herself about how powerful you have become!

Filimos: 'Holy, He Or I Guess She Just shattered A Small contained portion of Reality! I've never seen anything like it before! How powerful is she!?'

Modor: "WHAT!? IMPOSSIBLE!"

Y/n: "Hey Modor! You're Gonna Die."

You then Glared at the Demon Lord, as he Just Repulsed back in Fear and Gritted his Teeth in Anger!

Modor: "GO AND DIE!!"

He then Began Galloping towards you, as you then activated your observation Haki, and you began viewing things A Few seconds into the Future, and you began easily dodging all of his Attacks, as he then fired A Massive Fireball, at you, but you saw it coming, and then smiled!

Y/n: "Too Slow."

And the Fireball blew up some of his own soldiers as Modor began to Get Angrier!

Mordor: "DAMN YOU HUMAN! I WILL USE YOUR ENTRAILS TO HANG YOU BY THE NECK TO THE TREE! ELK CHARGE!!"

He then began charging at you, as you Just Put your sword, In Your Mouth, and Created two Light blades in your Hands, as you began to Just relax!

Y/n: 'Remember what Zoro Told you. Just relax."

He began running closer to you and he had his arms out ready to stab you, but you activated your observation Haki and began dodging his rapid strikes just trying to relax!

Y/n: 'Calm down. Relax. Think of Happy thoughts.'

You then began thinking of all of the friends and family you had made in such A Short time as you smiled!

Y/n: 'I'm Ready.'

A/N: Song at 1:50

Y/n: "9 mountains and 8 Seas Make 1 World, 1,000 World Make A Chiliocosm, and One Chiliocosm by the power of Three, and there's nothing That I can't cut...Three sword Style Secret Technique: Billion Fold world... TRICHILIOCOSM!!!!!"

Modor: "W-W-WHAAAAAAAAT!?"

You then Struck The Demon Lord, and He was sliced right in Half, as both halves then exploded into Nothing, as everyone watched!

Y/n: "So... Does anyone else want some?"

Demons: "RUN AWAY!!!!"

They all Ran off as soon in any way possible, as you smiled, and you put your blade back into your Sheathe, as you got up and walked towards, your group as Filimos grabbed your arm as she quickly realized all of her Students were in the group of survivors and are Okay!

Y/n: "Huh? What is it, Princess? You wanna Thank me?"

Filimos: "Yes, but Also... Thank you for saving me and All of My Students."

Y/n: "Heh, Your welcome. That's the kind of Chancellor I am."

Filimos: "But one more thing."

Y/n: "Huh?"

Filimos: "I guess it was just hard to tell it was me, as it was like Goku returning to his Friends after several years of Training at the End of Z But... It's me Y/n! Ms. Oka! You're Favorite Homeroom teacher!"

Y/n: 

https://youtu.be/sGtY1aPrOMQ