1girl, ahoge, bad_pixiv_id, bare_arms, bare_shoulders, breasts, brown_eyes, brown_hair, closed_mouth, collarbone, feet_out_of_frame, hair_between_eyes, hijouguti, knees_up, long_hair, looking_at_viewer, name_tag, old_school_swimsuit, on_floor, one-piece_swimsuit, onii-chan_wa_oshimai!, oyama_mahiro, school_swimsuit, sitting, small_breasts, soap_bubbles, solo, swimsuit, tile_wall, tiles, very_long_hair, white_one-piece_swimsuit