1girl, ass, ball, beachball, bikini, brown_hair, closed_eyes, cowboy_shot, door, facing_viewer, frilled_bikini, frills, indoors, kmtm_kmk0819, kono_subarashii_sekai_ni_shukufuku_wo!, megumin, red_bikini, rei_no_pool, short_hair, short_hair_with_long_locks, smile, solo, standing, swimsuit