nova borealis, seiun sky (reeling in the big one) (umamusume), seiun sky (umamusume), umamusume, 1girl, animal ears, blue eyes, blush, cat, choker, closed eyes, dreaming, drooling, ear covers, english text, hair between eyes, horse ears, horse girl, horse tail, jacket, looking at viewer, lying, on back, open mouth, puffy short sleeves, puffy sleeves, sailor collar, shirt, short hair, short sleeves, single ear cover, skirt, sleeping, smile, tail, teeth, track jacket, upper teeth only