1boy, 3girls, bikini, blush, breasts, casual_one-piece_swimsuit, cleavage, collarbone, duffy, faceless, faceless_male, flying_sweatdrops, frilled_bikini, frilled_one-piece_swimsuit, frills, headpat, hug, idolmaster, idolmaster_cinderella_girls, light_smile, looking_at_viewer, mifune_miyu, multiple_girls, nose_blush, one-piece_swimsuit, producer_(idolmaster), sajo_yukimi, simple_background, speech_bubble, swimsuit, white_background, yusa_kozue