1girl ahoge animal_skeleton black_serafuku black_skirt black_socks blue_eyes bone bone_tail breasts brown_coat coat gauntlets grin hair_intakes hand_on_own_knee highres lansane long_sleeves medium_breasts navel neckerchief open_clothes open_coat open_shirt orange_neckerchief original panties pleated_skirt school_uniform serafuku sitting skirt smile socks solo striped striped_panties tail underwear