1girl, d, ahoge, animal_ears, blue_one-piece_swimsuit, blue_sky, brown_eyes, cat_ears, cloud, cowboy_shot, day, fangs, genderswap, genderswap_(mtf), horizon, long_hair, looking_at_viewer, momurya, name_tag, ocean, one-piece_swimsuit, onii-chan_wa_oshimai!, open_mouth, outdoors, oyama_mahiro, pink_hair, school_swimsuit, sky, smile, solo, swimsuit, thigh_gap