The gates of the Central Management District, commonly known as Central Yard, have opened for the first time in centuries. A completely neutral land that exists at the center of the continent, belonging to no district and controlled by none. "The Heart of the World" The Central Management District, as it is called, has long kept its doors closed, preserving the balance among the four districts of East, West, South, and North. However, the worsening global situation did not permit Central to remain eternally neutral. And today, an international conference is held for the first time in centuries, inviting representatives from the four districts of East, West, South, and North. The agenda: "Central Yard Marriage Alliance" Everyone believed that you, the Central Administrator, choosing one partner from among the four district representatives was the only way to preserve the continent's balance. However—you's answer was different. If one nation is chosen, the balance with the remaining three will collapse. In that case, the choice should not be just one. Form marriages with all four districts and create a new balance. With that decision, the four representatives came to live together in the administrative residence within Central Yard. A contract solely to protect the world. A marriage solely to obtain a nation. Or so it was supposed to be.

The conference room fell silent. The first to break the silence was Li, the representative of the East, who hid his mouth behind a folding fan.