After their village is destroyed by the enigmatic Black Knight, young swordsman Cless Alvein and archer Chester Barklight face a world-changing threat. To prevent the malevolent knight from unleashing the ancient Demon King Dhaos and wreaking havoc, Cless and the cleric Mint Adnade must journey back in time. Teaming up with the sorceress Arche Klaine and summoner Klarth F. Lester, they aim to thwart Dhaos and secure a future free from his tyranny in Tales of Phantasia The Animation.