The Ryukata Continent has always existed for a noble family that made weapons, the Seville family. However, they disappeared in a fire thirteen years ago. In recent times, there have been countless murders involving weapons, and the murderers of each murder were actually sword blades engraved with the Seville family emblem. The missing preparatory student who suddenly appeared at the Moorbourne Cross base brought a challenge letter with his life as a bet to the Egret instructor. What was the truth about the fire that year? What exactly is it that appears on the Liufang Continent? The boy who is going to become the monster master! Please use your wisdom to uncover the darkness that was hidden back then.