Based in the Light novel of the same name.
In the wraparound jacket of the Light Novel series “Tsumibito wa Ryu to Odoru: Dances with the Dragons” (Even So, Sinners dance with Dragons: Dance with the Dragons) has announced that an Anime adaptation has been greenlighted.
Anime News Network describes the story as follows:
“The story revolves around “jushiki” (lit. spell equations), the equations that govern the quantum constant “h” of action, change the laws of physics at the local scale, give birth to TNT explosives and poison gas, and cause incredible physical phenomena such as plasma and nuclear fusion. Two “jushikishi” (spell equationists) who use jushiki in battle are Gayus (who deals with bad luck with tact) and the beautiful but cruel sword-wielder Gigina. These two bounty hunters are caught up in a battle with dragons in the city of Eridana and in the intrigue of great nations.”
Most of the details are unknown.
Via: Anime News Network