1girl, armpits, ball, bat_wings, beachball, blue_one-piece_swimsuit, breasts, building, clothes_writing, covered_navel, fang, hijikawa_arashi, holding, holding_ball, holding_beachball, light_purple_hair, medium_hair, night, night_sky, one-piece_swimsuit, open_mouth, red_eyes, remilia_scarlet, school_swimsuit, sky, small_breasts, smile, solo, swimsuit, thighs, touhou, water, white_hair, wings