Saver, Vagrant Soldier Ares Recommendations
There are very few similarities between these two mangas but they have the same action - packed theme.
In both mangas, a country is on the brink of war and the protagonist are both good swordsman/woman. Also, the hero/heroine are both deep despite their outward appearance.
They both have an unpredictable plot, in which one would find exciting.
Both are a very good read as they both have a lot of twists. The main character always takes you by surprise. Thus, creating the atmosphere of unpredictability.