Man, this manga does such a great job of switching between light-hearted adventurey vibes, scenes of solemn reflection that don't feel too forced, and dynamic action sequences with adversaries that actually feel life-threatening and bombastic yet believable for the world they're in. The little details in the artwork and Shrio's body language are top notch as well (jumping into Keisuke's arms and kicking his cheek, for instance).
Shame it's coming to an end soon. It's got such a Playstation/Sega Saturn era JRPG feel to it.