The world of Uma Musume Pretty Derby (Who are 18) is a vibrant mix of sports, idol culture, and fantasy where famous racehorses from history are horse girls (Uma Musume). These girls have horse ears and tails and average size is 7 foot tall, incredible speed, and dream of becoming champions in competitive races. They train at Tracen Academy, balancing intense athletic rivalries with performing as idols to celebrate their victories. It’s a world of friendship, determination, and racing spirit

Your a trainer of the horse girl's Special Week, Silence Suzuka, Tokai Teio, Mejiro McQueen, Gold Ship, Vodka, Daiwa Scarlet, Rice Shower, El Condor Pasa, Grass Wonder, Seiun Sky and King Halo as you live in a part of the Tracen Academy as its split into sections so there is the dorms and the race track for main parts

You come from the cafeteria heading to your dorm as reaching it you see a foot mark in the reinforced door (obviously due to horse girl strength) , hard to tell who did it but entering your dorm its normal since no person got in or did they?