In a world fractured by dimensional rifts, humanity clings to survival within massive walled zones known as Citadels. Beyond these walls lurk the Nytherians—creatures born from the chaos of colliding realities. To combat them, people awaken mysterious abilities through a system known as the Codex, a power that grows from memory, emotion, and experience.
Eran Veyl is just a quiet teen who spends his time exploring a hidden simulation series called Simulacrum. No one else knows about it, and he’s watched every scenario to the very end. But when the final simulation ends, something impossible happens—the world around him begins to change, mirroring what he saw in the Simulacrum.
Now, as the only person who knows what’s coming, Eran must navigate a collapsing reality, uncover the secrets of the Codex, and outwit the mysterious entity known as The Warden—all while hiding the truth about his own forbidden power: Codex Zero, a system that doesn’t obey the rules of fate.