Why Does Nobody Remember Me in This World?

Humanity once survived a brutal war against four dominant races—angels, demons, the undead, and humanoid beasts—only because of the hero Sid, who overcame their champions and sealed their forces within four pyramids. Long after Sid faded into legend, Kai Sakura Vento serves as a conscript assigned to watch over those pyramids, wary of what might happen if the ancient enemies ever break free.

During a quiet day with his friend Jeanne E. Anise, reality abruptly “overwrites” itself, leaving Kai stranded in a world where demons have nearly wiped out humanity and driven the survivors into hiding. Worse still, Kai has been erased from everyone’s memories; even Jeanne—now a key figure in the local resistance—doesn’t recognize him.

Searching for answers amid the remnants of what he once knew, Kai discovers Rinne, a mysterious girl imprisoned inside one of the pyramids. After coming into Sid’s fabled sword, Codeholder, he frees her and allies with Rinne and Jeanne to challenge demonic rule. To reclaim the life and world that vanished, Kai must uncover what caused the reality shift in the first place.