Teen alchemist Mariela is learning to adjust to all the changes in her homeland following her 200-year-long slumber, and now she's not alone in her endeavors: a young man and former slave named Sieg has pledged to stay by her side and help. But there are more changes in store for the region: a tragedy among the Labyrinth Suppression Forces, an A-Rank adventurer called Lightning Empress Elsee...and a 200-year-old alchemic secret?!