On that night thousands of years ago, a door to time and space appeared out of thin air, a crazy back and blood-red eyes slowly appeared in front of it... Thousands of years passed by, and now the door, which people also call "Dragon Mirror", became temporarily quiet with the appearance of five dragon gods. However, new races appear out of thin air; dragons continue to evolve; and territories continue to be encroached upon, but no one has truly discovered the truth of that year: Who opened that door? Who brought dragons into this world? Who has changed us? Only the roar of the dragon kept whispering in the air, as if it was saying that the curtain of the truth was about to be unveiled now...