Young Prince Arslan faces his father's hatred and his mother's disinterest in the medieval kingdom of Pars, and he yearns to understand more about the world. Despite being surrounded by poverty and enslavement, Arslan refuses to give up hope for a better world. When the neighboring nation of Lusitania invades Pars, everything changes, and Arslan is forced to grow up in an instant. Arslan Senki follows Prince Arslan to war, where he fights to rescue his country and family with the support of a small but loyal group of counselors. Along the way, the young prince discovers secrets around every corner and encounters foes who despise him for who he is, but he also makes allies in unexpected places.