1girl black_shirt blue_archive blue_buruma blue_eyes blue_hair blue_jacket blush breasts buruma garukichi halo highres jacket jacket_pull lanyard long_hair long_sleeves looking_at_viewer medium_breasts official_alternate_costume open_mouth shirt short_sleeves simple_background solo thighs track_jacket white_background yuuka_(blue_archive) yuuka_(gym_uniform)_(blue_archive)