1girl, ahoge, arknights, artist_name, ass, bikini, black_bikini, blue_sky, breasts, cloud, cloudy_sky, demon_horns, food, from_behind, hair_between_eyes, hair_ornament, hands_up, holding, holding_food, horns, looking_at_viewer, looking_back, medium_breasts, official_alternate_costume, outdoors, popsicle, purple_eyes, red_hair, senamashiro, shirt, side-tie_bikini_bottom, sky, slit_pupils, star_(symbol), star_hair_ornament, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), swimsuit, wading, water, white_shirt