As far as shoujos go, I thought this had an interesting premise.

Story: 7
The basic storyline is that a red-haired princess (Akage) is married off to a prince of another country for a peace treaty. She is shunned because she, a royal, has red hair instead of black hair. Yeah, that's right. And not only that, but throughout the story kings and royalty make crazy freaking decisions based solely on the fact that this girl has red hair. It's a puzzler to me...and despite all of the clearly corrupt, lazy, and plain stupid royals, the citizens don't complain or rise up even once. The background for either of the three countries that are presented is not really developed beyond what the climate is. But the plotholes and lack of storybuilding aside, the plotline was fairly linear, though some major elements are left undeveloped (the swords made of ore, the Arcana, etc.).

Art: 7
The characters all had lovely designs (Loki and Ahkil were my favorites), though they weren't all that diverse. Pretty much all the guys look female, too. The action scenes were a bit silly and awkward.

Character: 3
Meh. Main defining traits of characters were hair color, whether they were an Ajin or human, whether or not they had Arcana, and who they had a relationship with. The main character, Nakaba, was quick to cry or lash out.

Enjoyment: 6
I didn't hate it. It's definitely worth reading just for the ending and also Loki.

If you're looking for something to read through quickly but still enjoy some nice pictures, then Reimei No Arcana is for you.