1girl, barefoot, black_hair, blue_one-piece_swimsuit, competition_school_swimsuit, double_bun, from_behind, full_body, gokou_ruri, hair_bun, long_hair, looking_at_viewer, looking_back, mole, mole_under_eye, one-piece_swimsuit, ore_no_imouto_ga_konna_ni_kawaii_wake_ga_nai, purple_eyes, school_swimsuit, simple_background, sitting, solo, swimsuit, takatsuki_akira, wariza, white_background