1990s_(style), 1girl, black_hair, braid, braided_sidelock, casual_one-piece_swimsuit, closed_eyes, day, floating_hair, hair_ribbon, hat, holding, kai_tomohisa, long_hair, off_shoulder, one-piece_swimsuit, outdoors, retro_artstyle, ribbon, seashell, sentimental_graffiti, shell, shell_to_ear, sitting, smile, solo, straw_hat, sugihara_manami, sun_hat, swimsuit, swimsuit_under_clothes, wind