1boy, 1girl, akamatsu_kaede, beach, bikini, bikini_skirt, comic, danganronpa_(series), danganronpa_v3:_killing_harmony, frilled_bikini, frills, from_behind, greyscale, male_swimwear, monochrome, nogawa_harumi, ocean, oma_kokichi, playing, saihara_shuichi, sand_castle, sand_sculpture, short_hair, shorts, squatting, striped, striped_shorts, swimsuit, upper_body, yumeno_himiko