  In this paper, we investigated the space-time obtained by quotients of the
$AdS_4$ space-time. Further quotient with specific $\mathbb{Z}_2$ is
considered. Taking up to the first-order perturbation in metric, we estimated
the backreaction of the matter field on space-time geometry. We can calculate
the stress-energy tensor's expected value by pulling it back onto the covering
space. The average null energy becomes negative when the suitable boundary
condition is chosen, resulting in a traversable wormhole.
