In a world where hunters and mages brave deadly dungeons, I am an anomaly—an "Immortal" who cannot die, no matter how brutally my body is destroyed. But eternity is a lonely, agonizing curse when you are weak. Just as I was on the verge of losing my sanity from the endless cycle of death and resurrection, a mysterious entity manifested beside me.

It was a powerful, fiercely protective Guardian Spirit, bound permanently to my undying soul.

While I possess an infinite pool of lives, my spectral companion wields overwhelming, world-shaking magical power. She acts as both my ultimate shield and a devastating weapon, annihilating anyone who dares to harm her master. Together, we step into the deepest, most dangerous abysses on the planet. This is the story of an immortal extra and his clingy, all-powerful phantom rewriting the history of a world that thought death was the ultimate end.