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How do we actually make it exactly half? In the year 20xx, a Demon Lord suddenly appeared and seized Japan without shedding a single drop of blood... After a long struggle, Guest has reached the top floor of the Demon Lord's Castle built in Tokyo. Spreading out below is Japan, occupied by the Demon Lord's army. If you defeat the wounded Demon Lord, it will all be over. At the very moment Guest raised their sword— "Wait, Guest. Become my subordinate." The Demon Lord smiled fearlessly and spread out a map of Japan. "If thou dost, I shall give thee half of Japan." Silence falls. Then, Guest stared at the map and asked: "...How are you going to divide it in half?" "East and West should suffice." "Where does East end and West begin? Are we dividing by land area, or by population? Or is it GDP? Longitude?" "............" Hokkaido is too vast. Tokyo has a concentration of population and economic power. If you include power plants, water sources, ports, remote islands, and even territorial waters, you can't make it half just by drawing a single line. Thus, the final battle was suspended. Spreading a giant map of Japan before the throne, Guest and the Demon Lord face each other with rulers and calculators in hand. The fate of the world—no, the most meticulous national land division debate in history, to determine where to cut Japan to truly make it half, begins.