This is a world where names cannot be used. Anyone who violates the rules will be punished by heaven - no matter how powerful you are, you will eventually die.
However, under this strange code of heaven, people use their own abilities as their own pronouns, and at the same time, there is a shallow rule of "only one word can be used." Because with every additional word, their feelings for "it" will increase day by day. When the meaning of "it" is equated with itself, it will also be the day when heaven's punishment will come.