Elf mage Frieren and her courageous fellow adventurers have defeated the Demon King and brought peace to the land. But Frieren will long outlive the rest of her former party. How will she come to understand what life means to the people around her?

At the behest of the Continental Magic Association, Frieren and her friends are in the Imperial capital to stop a plot to assassinate the great mage Serie. Frieren must contend with the Imperial Special Forces on one side and a cabal of assassins known as the Shadow Warriors on the other. The hit is scheduled to take place at a grand ball, but before that happens the Shadow Warriors will make their move to take out Frieren in the streets of the city...