The summer 2018 anime adaptation of the How NOT to Summon a Demon Lord light novels wrapped up quite a bit ago and Funimation had previously set a July 30th, 2019 debut for it.
The light novels began in 2014 from Yukiya Murasaki and have twelve volumes out as of this writing.
The show was directed by Yuta Murano based on the series composition by Kazuyuki Fudeyasu.