[Crossover] The Rejuvenation Potion

After moving away from the two researchers who looked on the verge of tears, Nanami Nanami, the Seventh Nanami, feared by the world and called a "witch," quietly clenched both hands inside her pockets. In her left hand was a vial of a substance capable of changing the world and overturning every moral and ethical principle. She had made it for one simple reason: to find out whether she really could return to the past. To turn her body back fifteen years, to when she was fourteen. The art of reversing time, a potion of rejuvenation. Someone who could make such a thing truly was no different from a witch. Nanami Nanami smiled, a little smugly. That smile was every bit as wicked as the rumors about the "most evil" would have you believe.