  We study the $U(1)_A$ anomaly in the high-temperature phase of $N_f=2+1$
lattice QCD with chiral fermions. Gauge ensembles are generated with M\"obius
domain-wall (MDW) fermions, and in the measurements the determinant is
reweighted to that of overlap fermions. We report the results for the overlap
Dirac spectrum, $U(1)_A$ susceptibility, and topological susceptibility at
$T=204$ and $175$ MeV.
