Three thousand years of saving another world should have earned a peaceful retirement.

Instead, the Goddess sends the hero back to Earth as a girl, where ancient cosmic beings are beginning to stir—and the first people waiting to greet her are government officials with far too many questions.

Since nobody on Earth understands magic, someone has to build the system from scratch. Between negotiating with politicians, introducing modern magic, and proving that a fusion reactor can fit in the palm of her hand, she accidentally becomes the founder of an organization the entire world will soon depend on.