On my birthday night, my best friend made me read a book that was unfinished.
The next second, we both entered the book - the system forced us to become mortal enemies.
They quarrel with each other with their mouths, use their hands to exchange secret codes, and join forces to abuse the scum in the five worlds without telling the system.
He didn't know that we recognized each other from the moment we walked in——
[The cat's left ear is missing half of it. There is one in each of the five worlds. Someone is waiting for us.
