1girl, arknights, armpits, arms_up, ass_visible_through_thighs, bare_shoulders, bikini, breasts, cleavage, criss-cross_halter, detached_sleeves, hair_ornament, halterneck, horns, long_hair, long_sleeves, looking_at_viewer, navel, ocean, official_alternate_costume, purple_eyes, red_hair, solo, star_(symbol), star_hair_ornament, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), swimsuit, tian_kazuki, very_long_hair