mikozin,blue archive,atsuko (blue archive),1girl,black leotard,blush,breasts,covered navel,from below,grey halo,hair between eyes,hair ribbon,halo,highres,jacket,leotard,long hair,long sleeves,looking at viewer,medium breasts,open mouth,red eyes,ribbon,simple background,smile,solo,standing,sweat,thighs,white background,white jacket,yellow ribbon