1girl, ahoge, ass_visible_through_thighs, bare_arms, bare_shoulders, blue_one-piece_swimsuit, blush, brown_eyes, brown_hair, collarbone, covered_navel, feet_out_of_frame, flying_sweatdrops, head_tilt, long_hair, looking_at_viewer, name_tag, old_school_swimsuit, one-piece_swimsuit, onii-chan_wa_oshimai!, open_mouth, oyama_mahiro, school_swimsuit, simple_background, solo, standing, strap_slip, swimsuit, takasuma_hiro, very_long_hair, wavy_mouth, white_background