PLOT

The story follows elven mage Frieren, a former member of the party of adventurers who defeated the Demon King and restored harmony to the world after a ten-year quest. In the past, the heroic group included Frieren, human hero Himmel, dwarven warrior Eisen, and human priest Heiter. Before they part, they observe the Era Meteors together, a meteor shower that occurs once in fifty years. Frieren agrees to see them again and offers them a better view the next time the celestial event occurs. Frieren then departs and travels the world in pursuit of magical knowledge.

Frieren returns to the capital fifty years later; however, humanity has changed, and her former companions have distinctly aged.

Source: Wikipedia