A young adventurer named Ryddel watches as the world is destroyed and all his friends are killed by a mysterious organization known as the Box of Malice. Plunged into despair, he clings to one final, desperate hope: the possibility of returning to a time before everything ended. After surviving for a thousand years and transforming into something no longer entirely human, Ryddel finally succeeds in reversing the flow of time. Finding himself back in his own young body, he is now armed with the vast knowledge and experience gained over a millennium. His mission is clear: to stop the Box of Malice and prevent the catastrophe he alone remembers.

The story follows the great sage Ryddel as he navigates this second chance, using his future knowledge to alter past events. He is joined by Norn, a character described as both a source of hope and suffering for him, whose relationship with Ryddel is central to the narrative. The setting is a fantasy world threatened by the machinations of the Box of Malice, a shadowy group whose true nature and goals are slowly unraveled as Ryddel takes preemptive action.

Notable narrative arcs focus on Ryddel's efforts to save specific individuals he lost in the original timeline, his manipulation of key events using his thousand years of foresight, and the psychological toll of carrying the weight of a destroyed world. The anime is structured as a short-form series, with each episode having a runtime of approximately five minutes.