Adel Bellius is the first chapter in Imperial SaGa.
Adel is oriented by Koumei to fight monsters alongside James, Therese, Bear, Cat and Gerard, until they fight Death, after defeating him, Adel decides that the Altamenos Empire shall repel the monsters that plague Dysnomia.
Ending - WARNING SPOILERS!!!!
After defeating Death gor the second time, the latter sends Adel to the Netherworld, then, Albert, Gerard or Julian becomes the next emperor of Altamenos.