I don't own Mondaiji Tachi Ga Isekai Kara Kuru Sou Desu Yo? It belongs to Tatsunoko Taro

Frozen belongs to Disney

Also to let it clear, The timeline of this story would be between the volume 8 and 11 of the Mondaiji Light Novel

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Purple eyes began to open slowly, and he felt something cold touch his face. The first two things the man noticed was that, one, he is lying down in something soft but extremely cold, and two, is that it's snowing. Standing up with great difficult, he takes a look on his surroundings and what greets his sight is a mountain with some type of castle that looks to be made of ice.'' Where am I? What happened?'' These two thoughts kept plaguing his mind. Taking a step, he feels a sharp pain in his stomach, looking down he sees marks that looked more like claws.'' Wait, these wounds...'', Suddenly the memories of what happened crashed down on his head...

Little Garden: Volcano Top, 6 Hours ago...

''What a heavy body, my fists broke in the first punches.'' Thought one Sakamaki Izayoi. The Three headed dragon in front of him, demon lord Azi Dahaka wasn't even fazed by his punches that could shatter mountains easily. Sensing something behind him, Izayoi jumped to his left side but he wasn't fast enough, sharp claws cut through the flash of his back and he hissed in pain. Glancing behind, he saw a shadow that in just a few seconds took the form of a two headed dragon to his surprise. The beast then had gone to Azi's side and Izayoi realized that one of the fingers of the demon lord were bleeding. Soon, more dragons started to form.'' Shit, they are avatar of the divine class?'' The already bad situation was getting worse than he imagined.

-'' A goat with two girls just left, go after it and kill them.'' The demon lord spoke with malice leaking from his voice. Izayoi's eyes widened at these words. The copies of Azi Dahaka started to fly.

-'' As if I'll let you!'' He screamed while running in their direction. Focusing his strenght in his legs, Izayoi jumped in the air and aimed a punch at the Dragons but,as fast as bolt of lightning, a clawed hand held his left leg and threw him back to the ground. When he stood up, the dragons were already out of his view.

-'' Don't forget that I am your opponent hero!'' The three headed dragon spoke, his voice rumbling in the atmosphere.

Izayoi just gritted his teeth in frustration,'' I need to end this now.'' He gathered all of his strenght, then, in his broken right hand a light started to be emitted, this light transformed into an aurora that reached to the skies and began to absorb the light of the stars. Azi's eyes widened to their maximum '' Another Cosmology?'', The demon lord of Zoroastrianism decided that he couldn't hold back either.

-'' Start restriction in five elements!''. In the hands of Azi Dahaka, a sphere of heat started to form, it's heat even greater than the lava surrounding them. The two combatants looked at each other for a brief moment before lauching their attacks.

-''Aurora Pillar!''

-''Avesta!''

The two forces clashed against eachother and the result was the annihilation of the volcano peak. During the clash between the two cosmologies, a black hole formed and started to suck everything surrounding it. Azi clawed the ground to keep himself from being sucked but Izayoi didn't have such luck. being closer to the hole he was pushed towards it without having even a chance to hold onto something.

-''It's over hero of the new era, you were an honorable opponent but your journey ends here.'' These were the last words that Izayoi heard and then, everything went black...

-'' I was sucked by a black whole? No, not a black hole, some type of dimensional rift maybe? that seems more plausible.'' He kept walking in the direction of the castle,after three minutes he was in front of the stairs,'' If I'm correct then I can assume that I'm not in Little Garden anymore.'', The blonde teen climbed all the stairs and stood in front of the ice door , his entire body was aching and the blood was freely seeping out of his wounds, using his broken hands to open the big ass door, he grunted in pain, and when he finally opened it, unconsciousness took hold of him once again...

Arendelle: Royal Palace...

Queen Elsa of Arendelle sighed in annoyance. It's been one month since the ''frozen'' incident as people started to call it. She barely begun her reign and there were alredy a big number of problems to solve. From the harvest of the villagers till the lack of soldiers in the army of the kingdom. While reading the documents, she heard a knock on the door.

-'' Come in.'', She responded without even looking to the door.

-'' How is the life of a queen Elsie?'' A female voice asked in a teasing manner. Elsa just smiled drily at her sister.

-'' Till now it's being stressful Anna, I'm feeling like my head will explode.'', She joked slightly, after the entire incident, Elsa started to open up more to her sister and could even crack a joke from time to time. Anna just gave a chuckle.

-'' Why don't we go to your ice castle then? You know, to have a good sisterly time.'', Elsa groaned slightly.

-'' Anna you know that I can't, I have work to-''

-'' Come on Elsa it's just for half a day, please,please, pretty please?'' Elsa made the biggest mistake ever... she looked at Anna's pounting face and her will crambled.

-'' Okay, but just for a few hours, then I'll came back and finish my work understood?''

-'' Yay, Thank you Elsa!'', Anna exclaimed while hugging her, Elsa just gave a soft smile.

-''Go change you clothes so we can get going'', Nodding eagerly, Anna ran to her room. Elsa just shook her head in amusement at her sister's antics and went to her room to get more comfortable clothes too...

Top of the mountain: Ice Castle...

The walk lasted only for an hour. Anna complained about how cold it was and Elsa just shrugged her shoulders, good thing that the cold never bothered her. When the two sisters entered the castle, Marshmallow appeared in front of them.

-'' Hello Marshmallow, how are you doing?'', Elsa questioned. The Giant made of Ice started to swing it's arms, pointing to one of the rooms. The Ice Queen just frowned and walked in the direction that the giant pointed. Elsa started to hiperventilate when she saw the blood drops on the floor. When she finally got inside the room, her breath hitched.

-'' What's it Els-'' Anna's voice stopped abruptly and the two sisters could only stare in horror at what they were seeing. A man with blonde hair, who looked to be in his late teens and was covered in blood, there were three holes in his stomach. The queen and the princess could only stare and, without further ado, the two passed out.

Marshmallow could only stare at the two woman sprawled on the ground and shake it's head as if in exasperation...

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AN:This is the first Mondaiji/Frozen Crossover!, so what do you guys think? Liked it? Hated it? Think I should continue?

This story will be updated a little slowly since I still have to finish my Bleach/ Fate Grand Order story.

Also, sorry if there are misspelling errors, english is not my first language and I didn't have anyone to beta read this.

I hope that this first chapter was enjoyable to everyone :D