import graph3;
usepackage("icomma");

size(8cm,0);
currentprojection=orthographic(1.5,1,1);

bbox3 b=limits((-2,-1,-.5), (0,1,1.5));

xaxis(rotate(X)*"$x$", b, RightTicks(rotate(X)*Label));
xaxis(b.Y(), b.XY(), LeftTicks(Label("%")));

yaxis(b, RightTicks(Label("%"),Step=.5,step=.25));
yaxis(rotate(Y)*"$y$", b.X(), b.XY(), LeftTicks(Step=.5,step=.25));

zaxis("$z$", b.Y(), b.YZ(), LeftTicks(), dir=b.Y());

draw((-1,0,-0.5),linewidth(1mm));