The storyline of The Seven Deadly Sins: Origin centers on Tristan, the son of Meliodas and Elizabeth, as he embarks on a quest to restore balance to Britannia, a land disrupted by the mysterious "Star Fragment." This artifact has caused distortions in time and space, leading to anomalies and the reappearance of characters from the past. Tristan's journey takes him through various regions, including Lake Pernes and the Fairy realm, where he uncovers secrets about the Star Fragment and confronts challenges like battling golems and werewolf warriors. Throughout his adventure, Tristan is joined by allies from both The Seven Deadly Sins and Four Knights of the Apocalypse, as they work together to correct the space-time distortions threatening their world.