1girl, o, beach, bikini, blue_sky, blush, breasts, brown_hair, cleavage, collarbone, day, full-face_blush, heel_up, huge_breasts, idolmaster, idolmaster_cinderella_girls, interlocked_fingers, looking_at_viewer, lying, mat, mukae_gou, on_stomach, outdoors, own_hands_together, sky, solo, swimsuit, totoki_airi, twintails, yellow_bikini