This school called "Zhixing" was never a campus, but a divine prison built on the corpse of the true God.
After the principal Du Yinsuan was assassinated, his body was eaten by thirteen powerful men and turned into the "Thirteen Powers". The school was divided into thirteen pieces of land, each of which was guarded by a false god.
They are teachers, grade directors, students chosen by rules, and gods in human skin.
When the "Faded Ones", an external organization, entered the campus in an attempt to eliminate the false gods and restore order, they discovered that the first thing that needed to be hunted was the hearts of gods that had long since been corrupted.
God is dead, but the power remains.
The bell rings and the blood feast begins.