1girl :d apron bell bird blush book character_name checkered_clothes checkered_shirt chibi chick clock closed_eyes clothes_writing commentary_request cup desk gasuto_(kamikami) hair_bell hair_ornament motoori_kosuzu music musical_note on_desk open_book open_mouth pink_hair shirt short_hair simple_background singing sitting sitting_on_desk skirt smile solo steam touhou two_side_up