Oh hey my first crossover fic! I find it fitting that I ended up crossing over two games that I've been obsessed with! The game that the character Nicki is from is called Summoner's War; a mobile game that's been around since 2014. I've been kind of a massive fan for a while now (as you can see in my profile).

Nicki is the dark Occult Girl. Monika is from Doki Doki Literature Club; a great "dating simulator/visual novel" game. I do not own a Nicki in Summoner's War, sadly :P

I also do not take credit for owning anyone except and possibly a few other original characters I might introduce later on in this fanfic.

Prologue
Rebirth

How…?

How could she have been so blind?

Nicki was your average Occult Girl; well, as average as she could be. The world she lived in; more specifically the continent of Mystica was filled with otherworldly beings with strange powers, whom "humans" – or Summoners, as they called them – called monsters. Some were demons, others wolves and wild animals (now domesticated and their powers honed for the Summoner's benefit), and others looked almost human.

Nicki was one of the latter. Right now, she stood in the Arena, surrounded by her friends: Tiana, the wind Polar Queen. Galleon, the water Pirate Captain. And Zaiross, the fire Dragon. Together, the four of them have destroyed countless Arena Defense teams.

She held her umbrella in one hand, constantly holding it above her dark hair tied into curly pigtails. Her bright red eyes would scan the area, assessing the danger and the enemies. In an instant, she'd decide who to attack and when, using which of her magic skills.

Then, throwing her teddy bear in the air, she would wait for the bear to fall back into her hands and grip both arms tightly, channeling the power of darkness into the toy. Her teddy would spring to life, giggling sweetly before snarling and chomping down on the soft flesh of an enemy. The poison that flowed through the bear's teeth infected the unfortunate target, and had a chance to put them to sleep.

The remaining two monsters on the opposite side did not stand a chance against the four. The day flew by in a blur, and the four monsters still standing left the Arena to return back home, to their Sky Island. Every Summoner had a Sky Island. It's where they summoned their monsters and trained them. It was also where the monsters lived and socialized.

"Any breakthroughs on yer research yet?" Galleon piped up as the four monsters continued walking. Nicki looked up, being snapped out of her train of thought as she turned to look at the Pirate Captain, smiling softly.

He was a handsome young thing; perhaps about 25 or so. Silver hair peeked out from his sky blue hat that he always had on and tipped to the right, covering up a bit of his eyepatch. His coat, a similar color to his hat, was half-open, revealing his eight-pack of abs. Galleon was certainly beautiful, and Nicki wouldn't mind dating him.

Then again, Nicki was 14.

"I wish, Galleon." Nicki sighed softly. "I've gotten to the point where the only thing left for me is to visit the Dimensional Hole myself."

"Do you truly think that is a good idea, Nicki?" Tiana piped up, her voice soft and delicate much like the breeze that blew through the arena; the stones curving above their heads. Long, brunette hair flowed down her back, her golden dress made out of silk and pooling on the ground. On her head was a crown, embedded with only the most expensive of jewels.

The Dimensional Hole was perhaps the fondest enigma of anywhere you could think of in the continent of Mystica. It was a strange portal that had never been opened to the public. No one knew what the Dimensional Hole was, where it took you to or what it did. All they knew was that it was a building with a swirling blue portal inside.

There had been security measures taken to make sure that no one could enter it before it was released, but Nicki had studied them so intensely that she knew all the blind spots in them. That was another thing – ever since Nicki had been summoned to her island she wanted to know everything about the Dimensional Hole and learn what it does.

Perhaps what Nicki's motive was, her reason behind all this work, was to win over Galleon's heart. Nevertheless, tonight would have to be the night she entered the Dimensional Hole herself. She'd be the first monster to know what was in there.

"I'm not sure myself, Tiana." Nicki shook her head. "But…if it gets me new results, I guess it's the final step to enlightenment."

"Ye 'xcited?" Galleon grinned at her, making Nicki's heart flutter.

"…Yeah." She smiled. They had exited the Arena by now. Sky trains zipped to and fro on the blue atmosphere like long silver bullets, a few feet above the clouds. The metal gleamed in the sunlight as they whizzed by at almost light speed – at least, it seemed that quick to Nicki. That was what the monsters took to return to their island. It was odd how the trains could move in the air without any suspensions or tracks, but Nicki never questioned it. In fact, no one did. It was a perfect part of their reality.

"Are you going now?" Tiana asked Nicki, gently caressing Zaiross's shiny black scales with one hand. The dragon grunted in appreciation, a tiny burst of flame popping out of his nostrils.

"…Yeah. I might as well." Nicki shrugged. She wasn't really used in Cairos Dungeon; where her Summoner acquired runes for the monsters. Runes were another peculiar thing. They were basically like armor; giving boosts and advantages if put in certain sets. There were six slots in each monster's nape of their neck, and each slot could fit a different rune.

"Ye sure ya don' wanna come along? We'r gonn' get food as a c'lebration!" Galleon crowed, pointing one finger into the air.

"I'm sure." Nicki smiled. She felt warm inside. "Go on without me. Oh, and save me some food, hey?"

"I will make sure Galleon does not eat it all. I promise." Tiana smiled back at the girl. With that, Nicki went in the opposite direction. Find the silver train with red markings… The train Nicki had in mind didn't actually exist; it was a strange illusion that warped people straight to the Dimensional Hole without needing to directly travel there. Nicki's theory was that it only appeared to those who truly wished to find it.

As she stood by herself, the train screeched to a stop. Just as Nicki had pictured it in her mind's eye, the metal was so silver it was almost white, coated with red paint streaking down the shell like blood. Nicki's heart was pounding in her chest in a mix of nervousness and excitement. This was it. This was the day she learned the truth of the Dimensional Hole.

Just as she learned, the train instantly took her there. She didn't even remember stepping in, and before she knew it she stood in front of the building, kept clean and pristine but was never released. The aura around the Dimensional Hole was eerie, like something was wrong, but Nicki brushed it off. Can't get cold feet now, she said to herself.

Without even thinking Nicki began to walk, remembering directions and weaknesses that each security system had. Leap up there, turn left, duck now, it was all muscle memory to her. Eventually, she stood in front of the whirling blue light. This was it.

As she stepped in, lights flooded her vision. Black and white and green and red and white and blue…it didn't stop. It was painful. So painful. Nicki trembled in agony, and then the pain hit her like a hammer to the back of the head. It was unbearable.

T͕̝h̺e҉̜̮̬̻͓̩ ̙͈̪͔̩̀ṕ͉̺a̱͓͖̦i̫̗̙͟n͝ ̙o̤̳̮̰͟f͔̯͈̖̖͓ ̸͇̦̘͇͈͕̰k̹̜͔͠ͅn̩̣̪̝o̙̝͞w͚͎̥̩͖̤̙i͚̥͉͞ǹ͈͚͙g̱͖̦͈͕̠͜.̰̯.̖͝.͜

Nicki screamed as the burning sensation washed over her body. Black and white and red and green and blue filled her vision all over again, and she clawed desperately at her pigtails, her cries heard by no one but herself. It hurt so much. Tears dripped down her round face, and she felt like she was about to throw up blood.

.̶̍ͪ̈̓͑ͭ.̇̅̉̋҉͇̰̝̯.̣̤̮̿̓̌̊i̬̜t̲̰̞̭̹͙̍͗̆ͣ͘'͓̼ͨ̈́̇s̅ ͉̖͉̮̼̫͚̔̅̓ͪ̒̍ͮt̥̑͘ͅo͚̮͂ͯ̈ͧͣ̕oͬ͒̓ͤ҉̲̙̪͙͕̩͙ ̃̈̆̆ͤ̚m̪̪̪̬͍͊̔͝u̗̥͖̗̣͊̎͘c͖̃̽͒̅̀h̔̏͌҉͙.̴̜̇̌ͦ̐͛̋