Saredo Tsumibito wa Ryuu to Odoru recently announced on their official website as well as their Twitter account that the release date has to be pushed back. The anime was scheduled to be released in October 2017, but will instead go on air in April 2018.

The anime is based on a light novel that has released 19 volumes so far. The two main characters use Jishiki (=spell formulae) to fight their battles against the world’s unfairness. The anime stars Yoshimasa Hosoya who was cast as Gaius and Nobunaga Shimazaki who will play Gigina. The theme song has also been announced to be provided by fripSide, but now the series has been postponed. The measures were announced to have been taken for the sake of production, so we can only hope and wait for another good anime to come up in the Spring 2018 season!

source: https://animeanime.jp/article/2017/09/22/35405.html