1girl blazer blush brown_eyes brown_hair chair commentary_request covering_own_mouth from_above hair_ribbon heart idolmaster idolmaster_cinderella_girls idolmaster_cinderella_girls_starlight_stage jacket letter long_hair long_sleeves looking_at_viewer love_letter one_side_up pink_check_school_(idolmaster) plaid plaid_skirt pleated_skirt ribbon satou_kuuki school_chair school_uniform shimamura_uzuki sitting skirt solo sweat