Rule 34 Dev - 1girl ahoge black-framed_eyewear black_jacket blue_hair collarbone glasses grey_background hand_on_own_cheek hand_on_own_face idolmaster idolmaster_cinderella_girls jacket jewelry looking_at_viewer necklace short_hair simple_background sleeve_cuffs smile solo unu_(unucence) upper_body wakui_rumi|13365256203