1girl, arknights, armpits, arms_up, bad_twitter_id, bikini, black_ribbon, bow, breasts, cleavage, closed_mouth, criss-cross_halter, detached_sleeves, evening, hair_intakes, halterneck, horizon, horns, long_hair, long_sleeves, looking_at_viewer, mento, navel, ocean, official_alternate_costume, orange_sky, photoshop_(medium), purple_eyes, red_hair, ribbon, side-tie_bikini_bottom, sky, solo, stomach, sunset, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), swimsuit, swimsuit_cover-up, thigh_gap, thigh_strap, very_long_hair, wading, water, white_bow