1girl, amiya_(arknights), arknights, beach, bikini, black_bikini, breasts, cleavage, closed_mouth, crossed_legs, cup, demon_girl, demon_horns, detached_sleeves, drinking_glass, feet_out_of_frame, hair_between_eyes, hair_rings, hammock, head_tilt, holding, holding_cup, horn_ornament, horns, large_breasts, lips, long_hair, looking_at_viewer, ocean, official_alternate_costume, oneniiiceday, outdoors, purple_eyes, red_hair, ribbon, sitting, smile, solo, star_ornament, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), swimsuit, swimsuit_cover-up, very_long_hair, water, water_drop, white_ribbon, white_sleeves