1girl, bikini, blush, breasts, brown_hair, cleavage, collarbone, frilled_bikini, frills, front-tie_bikini_top, front-tie_top, hair_ornament, hair_scrunchie, hakozaki_serika, halterneck, idolmaster, idolmaster_million_live!, inflatable_boat, long_hair, medium_breasts, navel, scrunchie, smile, solo, string_bikini, swimsuit, tetsujin_momoko, twintails, water, white_bikini, wrist_scrunchie, yellow_eyes