They Were Called Goblin Slayers is the 7th episode of Hai to Gensō no Grimgar anime adaptation. It first aired February 22, 2016.
Having learned of Mary's past (and how similar it is to what they have experienced with Manato), Haruhiro and the group decide to continue befriending Mary, although some of them are still unsure if it's possible. Haruhiro tells Mary about Manato and explains that it's hard to survive without a priest. As they continue to adventure, the group learns new skills and Mary slowly starts to interact more with the group.