Chapter 1 – Overcast

A/N: Hey everyone, it's been almost three years since I wrote GF fic, so I'm back with an AU based on a game I played a while ago called Rain. You don't have to play the game yourself in order to read this so don't worry about that.

Disclaimer: I don't own Gravity Falls or Rain.

Enjoy!

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Stan coughed as he made his way through the isles in the store, taking a can from one of the shelves and tossing it carelessly into his trolley before moving on to the next.

After finding out they ran out of food in the shack, he decided to make a trip to the convenience store.

This wouldn't have been a problem for him if he wasn't sick today.

His head ached and his face was warm to the touch. Sighing, he pushed his way toward the cashier to pay for everything, wanting to get back home as fast as possible. It wasn't long until he started coughing again, catching the attention of the cashier.

"Are you okay, sir?" she asked.

"Yeah, yeah. I'm fine," he said gruffly as he handed her the money before making his way to the exit with his grocery bags.

When he stepped outside the store and began walking back to his car, he blinked when he felt the first droplets of rain fall. He looked up to see dark clouds blocking the night sky.

It should be no surprise really since it had been raining a lot for the last few days.

Without a second thought, the old man hurried to his car as the rain began to fall harder. He sighed in relief as he settled in the driver's seat and placed his hands on the steering wheel. Now he wanted nothing else than to sit down in his armchair and never get up. He was about to start up the engine when he saw something in the rain.

He frowned and squinted to get a better look at it. It looked like a silhouette of a person standing on the sidewalk, a little girl. Her body was hard to make out, transparent, and she was shielding herself from the rain.

Stan blinked and took off his glasses to rub his eyes in disbelief. That can't be real. He must be a lot more tired than he previously thought. Yeah, that's it. He was hallucinating from sickness.

The girl was whipping her wet face with her sleeve when she finally noticed the old man watching her from inside in the car. She met his confused gaze and started waving at him frantically.

(At the time, he didn't know what she had been trying to tell him.)

Just then, another shape came into his view near the girl and….well, Stan had no idea what he was looking at.

The thing was incredibly tall, much taller than Stan was. Its body was transparent like the girl, but also skeletal in form. While its left hand looked normal enough, the left one was shaped like a thick curved club that was large enough to scrape the ground.

Despite the creature clearly not having a face, Stan could almost feel its glare cutting right through him. Its attention then turned to the girl who backed away from it and ran away. Stan watched in stunned silence as the creature began chasing her, dragging its heavy club on the ground with it.

Without thinking, Stan quickly stepped out of the car to see the direction they went. He didn't know what came over him, but he found himself hurrying after the two.

He ran as fast he could down the sidewalk, trying to not lose sight of them. Luckily, the sound of the monster's footsteps was loud enough for him to locate them.

He finally saw them disappear into an alley and was quick to follow them. He suddenly stopped when he felt a shudder travel through his body and looked back, not knowing what caused that.

Deciding not to dwell on it, he wasted no time and headed deeper into the alley.

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The downpour continued without showing any sign of stopping. Water leaked from roofs and pipes in down into the sewers.

Stan groaned as he continued his trek between the buildings. Why didn't I bring my umbrella along? He thought, feeling his suit getting heavier. He suddenly saw a roof up ahead and made his way to hide under it.

"What am I even doing?!" He muttered to himself angrily. He was chasing what was likely to be a hallucination in the middle of a rain storm!

Just when he was about to leave, he looked ahead and tensed up when he saw the monster standing where the path split into two.

The unknown creature was looking around and seemed to be searching for the girl. It suddenly turned around and Stan's breathing hitched as its gaze fell on him. He remained frozen in his spot, not knowing what to do. To his surprise, the creature simply stared for a moment and returned to look for the kid.

Blinking in surprise, Stan wondered why the thing didn't react to him at all. He soon got his answer when he looked down at himself and his eyes widened in horror.

His body was gone!

He couldn't see anything. No arms. No legs. Nothing! It took all of his willpower to prevent himself from screaming, not wanting to alert the monster of his presence.

Somehow, even though he couldn't see his body, he could still feel his wet suit clinging onto his skin and his fez on his head. He flexed his fingers experimentally and tried touching his face. It felt weird, feeling the touch of a hand on his skin yet not seeing it.

Stan finally realized it. He was….invisible, but how did this happen?

Stan found himself staring at the form of the monster, noticing the raindrops falling over its drenched transparent body and dripping on the ground.

Curious, the old man reached his hand out and watched in bewilderment as it appeared in the rain. He could see right through it though. How….?

Just then, Stan saw something at the other pathway. It was the girl, running through the puddles. While the unknown's back was turned to him, Stan sneaked past it as quietly as he could. Once he was far enough, he began running down the pathway.

What's going on? Why was he like this and what was that thing chasing them?

Stan stopped running to catch his breath and glanced up ahead.

He had to find answers. He had to find that girl.

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A/N: Thanks for reading. I would like to explain something before the story proceeds any further. Stan and Mabel are NOT related in this AU. The story will not work if they did. I wanted to address this right now so there won't be confusion later on. I already have the next two chapters mostly done so I will be updating it this at least once a week.