A young man named Riddle lost all of his friends and the entire world at the hands of a mysterious organization known as the Box of Malice. Having lost all hope of living, he dwelled in a pit of despair until he had one final revelation: what if he could return to a time before everything ended? After a thousand years, a deformed Riddle finally manages to reverse time, returning to his younger body with a thousand years of knowledge and experience intact. Equipped with this immense wisdom, the Great Sage Riddle begins his journey into the past, determined to stop the Box of Malice and prevent the destruction of everything he once lost.

The story follows Riddle, a powerful sage who has sacrificed his original form over centuries of research to achieve time regression. Alongside him is Norn, another key figure in his quest. The narrative is driven by Riddle's strategic use of his future knowledge to outmaneuver enemies who were previously unstoppable, revisiting critical moments and battles from his original timeline to alter their outcomes. The central conflict pits Riddle against the Box of Malice, the shadowy organization responsible for the apocalypse he seeks to undo. As he navigates his past, the manga explores themes of redemption, the burden of solitary knowledge, and the relentless pursuit of a second chance to save those who were once lost.