1girl, o, arknights, bare_legs, bare_shoulders, barefoot, bikini, black_eyes, black_hair, blue_sky, breasts, cloud, day, feet, foot_out_of_frame, hand_up, holding, holding_whistle, la_pluma_(arknights), la_pluma_(summer_flowers)_(arknights), looking_at_viewer, medium_breasts, navel, official_alternate_costume, open_mouth, outdoors, short_hair, sitting, sky, solo, stomach, swimsuit, thigh_strap, thighs, welt_(kinsei_koutenkyoku), whistle, white_bikini