1girl, ass, bare_shoulders, blue_eyes, blue_one-piece_swimsuit, bocchi_the_rock!, breasts, competition_school_swimsuit, double_bun, from_behind, gotoh_hitori, hair_between_eyes, hair_bun, hews, large_breasts, long_hair, looking_at_viewer, looking_back, one-piece_swimsuit, open_mouth, pink_hair, rubber_duck, school_swimsuit, sideboob, solo, swimsuit, water