In 320 AD, King Andragoras III's Kingdom of Pars is at war with neighboring Lusitania. Arslan, the young prince, seeks to prove his bravery on the battlefield for the first time. However, when the king is betrayed by a trusted official, the army is decimated and Ecbatana, the capital city, is sieged. With the army in ruins and enemies from other kingdoms threatening to conquer Ecbatana, Arslan must go on the run with his general Daryun at his side. They embark on a journey seeking allies who will help them reclaim their home. However, they face not only Lusitania's forces but also armies from other kingdoms that seek to conquer Ecbatana. Additionally, an enigmatic figure with a silver mask poses a dangerous threat to Arslan and his companions as he holds a secret that could jeopardize Arslans claim to the throne. Despite these challenges, Arslan must find the strength and courage to overcome them and prepare for the day when he becomes king.