1boy, 1girl, blush, breasts, collarbone, full-face_blush, half-closed_eyes, hand_on_another's_shoulder, hetero, hug, hug_from_behind, idolmaster, idolmaster_cinderella_girls, koshimizu_sachiko, looking_at_another, looking_up, pink_shirt, producer_(idolmaster), purple_eyes, ribbed_shirt, sakaki_imasato, shirt, small_breasts, white_shirt