Welcome to my attempt to this AU! I hope you enjoy this small "beginning" of the story. There will be more to this story that I have planned.

Scientist and top notch professional investigations around Paris traveled around the world investigating as to why there were disappearances of ships and people when they set sail and never return. Some fishermen or even tourists go out and take rides in boats to explore the wildlife out in the ocean. The one problem was they never return nor are they ever found. Many know that there's still far more things to discover from our world's ocean, was there a possibility there are creatures out there hunting the human race?

Paris citizen were afraid after hearing so many cases pop up recently that many refuse to even set foot near the ocean. There, however was one boy in the city who was generally curious about everything. Still, he was far too busy with things in his life to do more investigations on the subject. Adrien Agreste, son of the famous fashion designer in all of Paris had various things to do throughout the day such as interviews, photoshoots for magazine covers and issues, fencing, Chinese all while attending school. The boy was only 17 years old and has had the same crammed schedule for the last 4 years. Of course, various things changed with each coming day.

It was a nice, summer day when Adrien managed to slip by his bodyguard and headed towards his favorite cafe in Paris. He strolled the streets alone, wearing a black hoodie. It covered his face so- he hoped- no one would be able to recognize him. That's the last thing he wanted, was to attract unnecessary attention. Ordering his drink and pastry, he looked around, observing the cafe until he saw a familiar figure. Smiling to himself, he walked over, patting the person on his shoulder.

"Hey man, this is the first time you didn't come here late" the young blonde teased. Clicking his tongue, the man turned around to face him, pushing him away playfully. "Aye man, easy. Some of us non-famous folk have lives too" he chuckled. Adrien laughed, sitting in the chair across from him.

"Good to see you to Nino" Adrien chuckled lowly, fixing his hoodie. As they started up a small talk,mainly concerning Nino and his DJing career along with opening a club that he's been wanting for so long. The news that displayed on the monitor caught almost everyone's attention as the cafe went completely quiet.

This morning, a fisherman along with his colleagues caught this on video after sailing into the Atlantic sea and returning to shore.

The video was hazy and a bit blurred due to the camera being out of focus. There were cries of excitement as the camera was pointing towards the water. A shadowed figure swam under the water, coming close to the boat. Slowly, the creature rose from the water. The human like figure's head popped out, black hair covering its face.

The creature tilted its head slightly, revealing the shiny silver eyes and pale complexion it had. The men on the boat screamed in horror, repelling backwards as the video went blurry again due to the man's unsteady hand after the creature began to pull itself onto the boat.

After a few seconds, the video went back to focus, pointing to the spot from where the creature stood before only to see that it had already disappeared. The video ended after the confused men took their positions to man the boat back to land.

After many mysterious disappearances happening in the Atlantic sea, these fishermen are the first ones to come back with footage of unknown creatures that many believe, could be the reason why people have gone missing.

If that were the case, what is that they're after? How long have we been living beside us that we haven't recognized their existence?

Murmurs went throughout the cafe as people looked at each other in worry. Adrien and Nino looked at the TV screen wide eyed, before looking at each other with the same shocked look. "That's crazy, holy crap what if they're after us?" Adrien questioned, horrified. Nino shrugged, taking a slight sip of his drink.

"Don't jump to conclusions man, but still, how do we know that's even real? For all we know they could have just been a stunt by some idiots" Adrien pursed his lips and pointed a finger at him. "That's true"

"All these disappearances are still weird though, aren't you at least a little bit curious?" The model continued. Nino nodded. "Of course I am, but I'm gonna stick with the logical assumptions like, they all probably stuck across and iceberg and died somehow" receiving a slight kick on his knee, Adrien gave him a 'are-you-serious' look.

"Nino! I'm being serious!" Grabbing his knee in pain, Nino laughed it off and kicked him back. "Okay, chill bro! Damn. It's not like we'll be able to figure it out ourselves, although it would be a miracle if we did" A thought suddenly popped into his head, though it was crazy, he wanted to go out and investigate himself.

Based on what he saw on the news, there's a possibility that he'll be able to make it back alive. He saw a bunch of upsides to the situation, besides the risk of dying, it includes going out from his normal routine and get out to do something he wants. Adrien stared blankly at his best friend, who looked back concerned at his phased expression.

"Bro?"

"I'm gonna go see what's out there" Adrien whispered lowly. Nino, catching that, gave him a horrified-like look.

"What-? Dude! You're going to get yourself killed. That's a bad idea" Nino crossed his arms, shaking his head at the blonde. Rolling his eyes, Adrien copied Nino.

"What if there is something? You and I can solve this case and save a ton of people!" Adrien exclaimed, clearly too stubborn to let this go. Adrien always wanted to help everyone he could. He felt the need to do more than just be a model and a pretty boy.

He's not satisfied with that.

Sighing, Nino shook his head. "I hope I won't regret this..." he mumbled. "Fine, but if we get our asses in trouble, you're taking the blame for everything" Eagerly nodding, Adrien smiled widely. He clasped his hands together, getting up from his chair after hearing his named being called from the counter.

Marinette peaked her head just above the water's surface, her eyes catching a glimpse of the land which stood feet away from where she was. Her dark blue hair shimmered and floated on the water, moving left to right as the waves went up and down. Her pale skin shimmered as her small scales on her face turned various shades of pink and red as the light reflected off of them.

"Alya come up,it's safe" The blue haired girl sighed and rolled her eyes. The brunette girl popped up beside her, sticking her head out of the water cautiously. "Oh hohoho, this is gonna be exciting. Do you think we'll be able to see some humans?" Alya's eyes sparkled in excitement. Marinette shrugged, not giving the slightest expression of excitement as her best friend.

She was sort of excited but still, she was way more nervous if anything. Ever since some of their own fellow merfolk began hanging out in the surface, Alya and Marinette have been dying to see what it was like. They planned forever ago to reach up to the surface, that was, until the violent attacks their own people made against the humans.

Merfolk viciously attacked innocent humans to feed on their own flesh and blood. They chanted that they needed to eliminate the humans, that they were useless and bothersome and must go. Accusations against the humans like these started a long time ago, billions of years ago even. The Greatest Massacre that happened between the two species nearly caused both humans and mermaids to become extinct.

The war went back and forth, the more hatred the humans had among the mermaids, they more they got ready to attack and kill them off. Mermaids had the upper advantage, having magic to manipulate the humans and kill as many as one thousand of them at once. Unfortunately, once they use an excess amount of strength and magic, they die off as well.

Ever since that tragic year, the mermaids lived peacefully and in hiding at the bottom of the sea, until recently. Now that some of their own kind has caused trouble with the humans again, their fear was starting up again another war.

"I have no idea. What makes you think they'll believe us. With so many humans being killed in under 2 months, will they believe that we won't hurt them?" Alya placed a hand under her chin.

"They might, you never know" Alya was bubbly and confident, something that she admired about her best friend. However, her logic with a few things wasn't the best.

"The killings are done by a group of no-at-all's, average of 5 people. There are tons of us who don't feel the same as them and want to not start a war. We gotta warn them somehow" Alya clicked her tongue and crossed her arm.

"Come on let's go!" She begged the pale skinned teen.

Her tanned skin glistened in the sunlight as she swam towards land, with Marinette following closely behind. The shorter girl kept her distance, where as Alya went up as close as possible. When they reached the dock closes to the deep waters of the ocean, they were both horrified at the site.

"Oh my god" it was nothing like they'd expected

Since this is the prologue, I promise the other chapters will be better in depth and not rushed.

Hope this was pleasing. Please stick around for more! ^-^