The second season of Isekai Maou to Shoukan Shoujo no Dorei Majutsu.
Diablo is back! You know…the Demon Lord from another world? Traveling through the woods with Rem and Shera, they encounter a lone girl in tatters, pursued by a powerful Paladin. You know what that means—Diablo will have to try and hide his lack of social skills once again (and come to her rescue, of course). Let the enchanting adventures continue!