The Promise We Made {Gundham TanakaX!Female Reader}

When you were young you stood up for a boy, the boy that for the next few years would become your best friend and partner in crime. After you two finish playing your favorite fantasy game he has you make a promise that you'd be by his side forever, to which you gladly agree, but a couple of months later you find out you have to move away. Distraught, you say your final goodbyes... Or so you thought...
You find out shortly after starting your first year of high school that you have been chosen to attend Hopes Peak Acadamy, an elite school for only ultimate students, as the Ultimate Empath in the 77th class. What awaits you there? And who?...