"Tales of Zestiria the X" is a fantasy anime series based on the "Tales of Zestiria" video game, blending action, adventure, and intricate world-building. The story is set in the continent of Glenwood, a land where humans and seraphim coexist, though most humans are unaware of the seraphim's presence. The narrative centers on Sorey, a young human raised by seraphim in the secluded village of Elysia. Sorey possesses the rare ability to see seraphim, a trait tied to his destiny as the Shepherd, a legendary figure destined to purify the world of malevolence, a corrupting force that spawns monsters known as hellions.

Sorey's journey begins when he and his seraphim companion, Mikleo, venture beyond Elysia and encounter Alisha, a princess knight from the kingdom of Hyland. Alisha seeks the Shepherd's aid to combat the growing threat of hellions plaguing her land. Sorey reluctantly accepts his role as the Shepherd, guided by the seraphim Lailah, who becomes his Prime Lord and imparts the power of armatization, a fusion between human and seraphim that enhances combat abilities. Together, Sorey, Mikleo, Lailah, and Alisha embark on a quest to purify the world, facing political intrigue, ancient conflicts, and the resurgence of the Lord of Calamity, a malevolent force threatening to engulf Glenwood in darkness.

As the story progresses, Sorey's party expands to include other seraphim and allies, such as Edna, a sarcastic earth seraph, and Zaveid, a rogue seraph with a mysterious past. The group uncovers the history of the Shepherd and the seraphim, revealing the tragic consequences of humanity's ignorance and the cyclical nature of malevolence. The narrative also explores the tension between humans and seraphim, as well as the moral complexities of Sorey's mission, particularly when his ideals clash with the harsh realities of the world.

The series intertwines its main plot with flashbacks and side stories, enriching the lore of Glenwood and its inhabitants. Key themes include the balance between light and darkness, the importance of coexistence, and the sacrifices required to protect the world. The anime also introduces original elements and characters not present in the game, such as the enigmatic Rose, a skilled assassin who becomes a pivotal figure in Sorey's journey. The story culminates in a climactic battle against the Lord of Calamity, testing Sorey's resolve and the bonds he has forged with his companions.

"Tales of Zestiria the X" is characterized by its expansive world, intricate mythology, and a diverse cast of characters, each with their own motivations and struggles. The narrative balances action-packed sequences with moments of introspection, creating a compelling tale of heroism, friendship, and the enduring fight against corruption.