Lucy vowed to protect her Guild, her Family. Even if she has to die by the hands of E.N.D, the person she loves the most... AU, after they have defeated Tartarus, a War against Zeref happened; a titanic war between the Mages of the Light and the Mages of Darkness. But the Celestial King has a backup plan, one that will require the sacrifice of a single person to save the many.

A scientist was given the chance to help save humanity and change the course of history. Now back into the past with the knowledge of the future, follow him as he help the witches rise as the ultimate protectors of the humanity.