The property comes from the light novel series The Asterisk War: The Academy City of the Water (Gakusen Toshi Asterisk).
Peppermint Anime brought out the first anime DVD and Blu-ray releases for The Asterisk War on February 23rd, 2018 and they’ve got the fourth dub clip for it now live.
It features the Japanese and German languages in PCM stereo with German subtitles included.