Er Mu - Release that Witch

Chen Yan traveled through time, only to end in Europe of the medieval period, becoming Roland — a Royal Prince. But this world doesn’t seem to be the same as his former world. Are witches are real and can they really use magic?
Follow Roland’s battle for the throne against his siblings! Will he win, even though the king has already declared him to be a hopeless case, and he has the worst starting situation? Only his experience with modern technology and the help of the witches — who incidentally, are known as devil’s servants and thus hunted by the the Holy Church, can help him succeed.
Now, let his journey begin!