This is the time when Succubus began to appear from within people

The battle between succubus and exorcist is becoming more and more fierce, triggered by the outpouring of miasma in the center of the continent.
The “Sanctuary”, a relic from before the disaster, has kept a dangerous equilibrium, but it is clear to everyone that this is a temporary peace.

An anomaly in the sanctuary was confirmed in the ruins on continental frontier

Three people, the witch Eleonora, the squire Sera, and the other witch Dorothy, took charge of the situation. There was no time to wait for more support.
In order to restart the stopped sanctuary as soon as possible, the three of them had to go into the dungeon where the miasma was spreading.