How Old Is This? Do You Still Engage in Traditional Demon Hunting?

[Multiple worlds + science fiction + high intensity + single female protagonist + slow heat] Also known as: Empire Returns (It has a self-defeating world view, and it unfolds slowly, so please forgive me) A story about an endless world of blood and tears composed of high energy and occasional comedy and irresponsibility. The empire was destroyed in the long river of time, until the divine blood was rekindled, and the boy finally ascended to the crown of the empire! Although the empire has fallen into a deep sleep and entered silence, if it wakes up, its raging flames will eventually burn down thousands of worlds! Burn the infinity! "War rules the world! Dictatorship maintains peace! Power brings freedom! War and conquer the enemy! Everything the emperor sees is our frontier Whatever the emperor wants is our goal! The battle the emperor wants is our long-cherished wish! The land at the Emperor's fingertips is our battlefield! "