2girls ;d bikini bikini_top_only black_gloves detached_collar exela_(summon_night) fingers_to_mouth gloves hat indoors instrument kuroboshi_kouhaku light_brown_hair long_hair looking_at_viewer microphone midriff mini_hat multiple_girls navel official_art one_eye_closed open_mouth outstretched_arm outstretched_hand piano plaid plaid_skirt silver_hair skirt smile summon_night summon_night_5 swimsuit veloce_(summon_night)