Sonju says that only Humans can break the Promise.
Thus far, only one promise has been revealed.
William Minerva mentioned the Seven Walls. chapter 72 p15-16
The Promised Pen and the Seven Walls. chapter 73 p11
GET THIS PIC PLS
- Humans won't hunt Demons anymore.
- Demons won't hunt Humans either.
- The world they live (Earth) in is divided in two.
- Crossing the border between the two worlds is forbidden.