After being called to a warring country in need of a hero, our isekai protagonists look for a way to return home while growing closer to the people they're fighting for. Throughout their respective journeys, we get to know more about the world and the characters surrounding the protagonist.
In contrast to the bloody, calculated wars of Hyakuren, the world of Dog Days has an approach to war that could only be described as fun - featuring colorful art, announcers, and protection magic. Since this hero is a frontline fighter and not a ruler, more focus is put on the action and show that he puts on.
Give Dog Days a try if you want a well-done, but not overly serious take on what it means to fight for something.