1girl armpits barefoot black_buruma black_sports_bra blue_archive buruma feet halo highres legs long_hair looking_at_viewer looking_to_the_side mutsuki_(blue_archive) navel open_mouth ponytail red_eyes signalviolet simple_background solo split sports_bra standing standing_on_one_leg standing_split teeth toenails toes upper_teeth_only very_long_hair white_background