  Excitation spectra and neutron single particle configurations of $^{33}$Mg
and $^{31}$Ne are investigated by using antisymmetrized molecular dynamics
combined with generator coordinate method. It is shown that both nuclei have
strongly deformed $3/2^-$ ground state with a $3p2h$ configuration. The
excitation spectra are qualitatively understood in terms of the Nilsson model
and the calculation has shown the coexistence of different intruder
configurations within small excitation energy. The calculated one neutron
separation energy of $^{31}$Ne is rather small ($S_n=250$ keV) and implies a
p-wave one neutron halo with a strongly deformed core.
