Following 14 years of peace since the Demon Clan's defeat by the Kingdom of Liones, Prince Tristan now grapples with his powerful inheritance from his parents: his father, Meliodas, former Dragon Sin of Wrath and captain of the Seven Deadly Sins, and his mother, Elizabeth, who passed on the strength of the Goddess Clan. In an effort to protect his mother from danger, the prince flees the kingdom and seeks refuge in Edinburgh under the protection of Deathpierce, a Holy Knight and former member of the Pleiades of the Azure Sky. Nevertheless, Deathpierce's intent remains unclear, and as Tristan searches for safety, fate sets events in motion that pull in The Seven Deadly Sins.