It has been announced by Seven Seas that the manga for Madan no Ou to Vanadis has been licensed and will release under them. They will release the manga in single volumes and the first one will be releasing September 13th 2016. Mind you that the manga adaption of the series which started October 5th 2011 is still ongoing and is based off of the original novel released for the series. That novel had released April 5th 2011 and also since that day has been ongoing its publication. The series would later get its anime adaption which first aired October 4th 2014 and ended December 27th 2014 releasing a total of 12 episodes. Following this is a plot summary of the series below quoted from MAL:
Set in Western Europe during times of war, Eleanor “Ellen” Vertalia, one of the Vanadis of Zhcted, leads the battle into Brune. There are, in fact, seven Vanadis, named for having each received a powerful weapon from the dragon to individually reign over seven territories. The power of the Vanadis invokes dread and fear from their enemies. An earl in the service of the country of Brune, a young archer by the name of Tigre, experienced the Vandis’s power firsthand after being defeated on the battlefield by Ellen. However, Ellen chose to spare his life after witnessing his skills, but in exchange, he is asked to serve her.