The Alchemist Who Survived Now Dreams of a Quiet City Life, Vol. 1 (manga) Cycle of the Elixir

When a stampeding horde of monsters threatened to destroy the world, Mariela the Alchemist would go on to survive. At the advice of her master, she placed herself in a state of suspended animation and awoke unaged and unharmed—two hundred years in the future! Alchemy is now a lost art, and potions have become scarce. As the last remaining alchemist, Mariela just wants a quiet life. But while she and her newfound allies work to carve out a slice of home for themselves in the Kingdom of Endalsia, keeping a low profile is harder than she thought.