1girl, ass, bare_shoulders, 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, monochrome, one-piece_swimsuit, open_mouth, school_swimsuit, sideboob, sketch, solo, swimsuit, unfinished, water