After decades of fighting on the front lines, Dias returns home a war hero. He’s rewarded with his own domain, which is little more than empty fields of grass... Or so he thinks until he meets a mysterious girl with a blue horn.

When Dias returns home from decades of war, he is rewarded with his own domain...which turns out to be little more than endless grassy plains. But when a horned girl named Alna appears, Dias discovers this empty frontier is more than it seems.