2girls, bikini, black_hair, blonde_hair, blue_eyes, brown_eyes, dutch_angle, face-to-face, hand_on_another's_waist, high_heels, hug, idolmaster, idolmaster_million_live!, legs_up, looking_at_viewer, multiple_girls, nakatani_iku, navel, one_side_up, open_mouth, pink_background, sailor_bikini, sailor_collar, sailor_swimsuit_(idolmaster), sandals, short_hair, simple_background, sketch, smile, sumitomo, suou_momoko, swimsuit, toes, white_bikini