I need a short story for my 2D side scroller game for a Kickstarter project

We are a start up indie game developers and we are looking for a 2D side scrolling game. We have artist and everything. All we need is a bit of start. For our game we need a good story, short story to get started. We want to make this project and upload it to Kickstarter.com, so we need some suitable story and game idea to get started with. Japanese or fantasy, all depends on you. I just need a short story for a 2d game. Simple story. i.e. ' Jon hated his younger brother because he'd always sit there and played GTA V (for example). One day this magical thing took him that appeared from no where in front of his elder brother. Now his elder follows the monster to save his younger, they all go in an adventurous journey ' <-- This is a story already made for a game. I need something like this simple and short. Please if you could help. I am paying you right away as i get the story as soon as possible.