200 years after Republic City was built, fighter jets are active and in the sky, as well as planes for passengers and goods. They have now made an exploration to the planet's moon by rocket. Ruins of fallen cities such as Omashu are currently being excavated by top archaeologists of the time period. One is a lonely man named Koto. He is currently 35 years, no wife and no children. He also does not have the ability to bend any known element, which is now very rare for this time period. He is searching in an old throne room, which was last inhabited by King Bumi. He spots a small pile of rubble in the corner of the room, and has a hunch there is something under it. He dig up the rubble carefully, then found a small wooden, dusty box. He opens the box to find a book. Right when he put his fingers to the book, he was blasted with an unbelievable amount of power. The front of the book was brown and had a leather cover. There were characters on the front of the book that he had never seen before. in fact, he had never seen anything like it. He opened the book.