1girl bag bed bed_sheet black_hair blanket blue_bag blue_sailor_collar blue_shirt blue_skirt bob_cut commentary face_down from_behind from_side full_body hair_strand holding holding_bag indoors kneeling long_sleeves mattaku_mousuke no_shoes on_floor original pleated_skirt rug sailor_collar school_bag school_uniform serafuku shirt short_hair skirt sleepy socks solo table twitter_username undershirt watermark white_socks wooden_floor