Since his childhood, Yoshihiro Yoshinaga has faced countless challenges, distancing himself from the company of others and the possibility of forging friendships due to a persistent problem: being harassed by spirits from an early age.

This constant spectral presence has cast shadows over his life, weaving a web of misfortunes. However, the course of his life takes a drastic turn when a giant demon unexpectedly emerges intent on taking his life. In the midst of this crisis, a chance encounter with Alicia Baal, a beautiful nun residing within a church, becomes the catalyst for a radical transformation to his destiny.