kashinoki_(koaaski), rhein_kraft_(umamusume), year_2024, 1girl, ahoge, animal_ears, camera, character_name, closed_mouth, dress, green_eyes, hair_rings, happy_birthday, horse_ears, horse_girl, horse_tail, jewelry, long_sleeves, lying, multicolored_hair, necklace, on_back, on_grass, one_eye_closed, outdoors, pinafore_dress, shade, shirt, short_hair, sleeveless, sleeveless_dress, solo, streaked_hair, tail, upper_body, white_dress, yellow_shirt, , umamusume