The untold past of Ayakawa and Yamagishi before they started dating…!? (Source: Core Magazine, translated)

Born as an imperial prince, Vilgard is forced into exile after a coup staged by his own brother. Fleeing to a neighboring kingdom, Vil—now a warrior—builds a new life. His days grow fulfilling, and he falls in love with his childhood friend Kiyoka. But the empire, hungry for expansion, invades his new home, stripping him of everything once again. Plunged into the depths of despair, Vil finds himself surrounded by the mightiest clan, drawn to him by an ancient pact. Determined to overthrow his brother, Vil rises up, taking powerful and beautiful women from across the land as his wives to bolster his forces. An erotic heroic tale of a man climbing from rock bottom bursts onto the scene! (Source: Monster Bunko, translated)

One day Mai Katamoto, a female college student who was chewing on a hot meat bun in a park on a cold day. Suddenly a cute cat approached her, and the cat said, "I finally met you!" in clear Japanese. Mai, who is frightened, tries to get away from the scene at a glance, but the cat tells her the truth and stops. At this time, no one knew that the encounter between these two would lead to the invasion of the Earth from aliens.