1girl, arknights, bad_pixiv_id, bare_shoulders, bikini, black_bikini, breasts, cleavage, criss-cross_halter, day, detached_sleeves, feet_out_of_frame, fui_(fui29493452), hair_ornament, hair_rings, halterneck, horns, large_breasts, long_hair, long_sleeves, looking_at_viewer, mouth_hold, navel, official_alternate_costume, outdoors, palm_tree, petals, purple_eyes, red_hair, sitting, solo, star_(symbol), star_hair_ornament, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), swimsuit, swimsuit_cover-up, thigh_gap, thigh_strap, tree, very_long_hair, water