The first 3 episodes seem muddled and confusing and may discourage some viewers. Western viewers will find the passionate love between the starring brother and sister rather disturbing. (As a side note, the anime series does not explain that the brother and sister are genetically engineered to be bonded and are not normal siblings.)
Once the series begins its story arcs, we have engaging stories, complex battles and technical strategizing. The plots involve magical-science theory, espionage, gangsters, and foreign invasions. The fighting becomes more intense and eventually rather gory. Depending on the magic used, some bodies simply vanish, while others may explode in a shower of blood and body parts.
I hope this gives you the info you need to decide whether to watch this or not. I expect some will love it and others will hate it!