Two years have passed since the riot in the Heavenly Empire. Lloyd and the princesses are now in their final year at the academy. Alongside a young girl named Nana who suddenly transferred in, their final school year begins! The world is peacefully moving in the direction of harmony and cooperation. As proof, "Mana Corridors" capable of mass transportation that bypasses the Anti-war Domain were erected within each of the empires. However, mysterious problems are occurring at these gates one after another. There are artifacts from a thousand years ago that not even Lloyd knows about... Secrets lead to more secrets in the 15th volume of this popular fantasy series!