Angels are responsible for maintaining order in the world and are existences unknown to people.
Wherever there are angels, there are demons; as the name suggests, demons are the opposite of angels. But one day after the struggle between angels and demons lasted for thousands of years, angels and demons reached an agreement. What exactly was the content of the agreement...
So one afternoon, a certain angel received a mysterious letter,
On the other side, a certain demon also received a letter. What is the content of the letter? Have angels and demons really made a truce? Or is there a bigger conspiracy hidden behind this agreement?