When does Soul Eater return?

Soul Eater is a Japanese manga series written and illustrated by Atsushi Ohkubo. Set at the "Death Weapon Meister Academy", the series revolves around three teams, each consisting of a weapon meister and (at least one) weapon that can transform into a humanoid. The meister students' goal is to have their weapons absorb the souls of 99 evil humans and one witch, in that order; otherwise, they will have to start all over again.