How could the stupid witch I picked up be a saint?

For the sake of revenge, I sold my soul and gained immense power.
The price, however, was becoming a vampire girl.

But for some reason, I was “tormented” for several years by a certain detestable person before finally escaping that “den of demons.”

The very first thing I did after fleeing was to seek revenge against the Holy Church.
And along the way, I even picked up…