A young scientist laboring to restore civilization centuries after a cataclysmic war unearths a devastatingly powerful doomsday weapon. When a marauding robot attacks, the weapon activates, saves her life, and then transforms into a handsome human guise, declaring her its new master. Inspired by a romance novel, this anthropomorphic weapon devotes himself entirely to his master, who realizes that her new companion may be the answer to her total inability to interact with human men. The story unfolds in a devastated world where a love transcending four centuries begins to develop between a socially awkward scientist and an ancient android weapon of mass destruction. As she continues her work to rebuild a shattered civilization, she must navigate the complications of being bonded to a being capable of untold destruction who now believes his sole purpose is to protect and cherish her. The series blends post-apocalyptic hard science fiction with romantic comedy, delivering humor alongside its worldbuilding and romance. Created by the manga duo Yuki Amemiya and Yukino Ichihara, known for their work on 07-Ghost, the story explores themes of connection, identity, and what it means to be human when the most powerful being on the planet has chosen to be a devoted husband.