Kakushite Mahoutsukai Noi Galeneé wa 100-nengo, Hanayome to Natta

Noi Galeneé is revered as the most powerful magician in her nation, yet she chooses a life of profound isolation. Residing alone in the remote mountains beyond the city limits, her quiet existence is abruptly interrupted when the state issues her a dire command: she must monitor and ultimately destroy a young boy harboring the spirit of the Demon King within him. Rather than executing her grim orders, Noi defies expectations. She grants the child the name Cardia, takes him under her wing as an apprentice, and offers him the sanctuary she herself has long inhabited. Together, they share days filled with unexpected warmth and tranquility, forging a bond that transcends their isolated circumstances. Yet this fragile peace exists under a looming shadow, as the inevitable awakening of the Demon King inside Cardia draws ever closer with each passing moment. Bound by duty, affection, and an impending catastrophe, the solitary mage and the lonely boy must navigate a destiny far greater than either anticipated. Their extraordinary journey unfolds across a century, weaving a sweeping tale of devotion, hidden magic, and the enduring hope that love might outlast even the darkest of prophecies.