The Zodiac War
Once upon a time, twelve stars fell from their constellations and became mortal. Each established a kingdom and promised to always remain one.
Once upon a time, twelve kingdoms have fallen and are deep in war. It was the very thing that brought them together that drove them apart.
Once upon a time, thousands of years later, twelve gifted students are summoned to the Headmaster's office. Their mission: fix the past to save the future.