  The low energy dynamics of a certain D-brane configuration in string theory
is described at weak t'Hooft coupling by a non-local version of the
Nambu-Jona-Lasinio model. We study this system at finite temperature and strong
t'Hooft coupling, using the string theory dual. We show that for sufficiently
low temperatures chiral symmetry is broken, while for temperatures larger then
the critical value, it gets restored. We compute the latent heat and observe
that the phase transition is of the first order.
