Imagine that any oath or promise, or rather, every phrase spoken with words “I swear” or “I promise” in your presence, acquires magical power, becomes a magical oath, and will be fulfilled. At any price. And literally. What would you do? How would you live? Two rival states. Two crown princes come of age. Each of them has the task of making friends with the other and finding out the enemy’s secrets. But things are never that simple...