In a world where the conflict between humans and demons has raged since ancient times, a young spy codenamed Coral has been trained from childhood. One day, Coral is entrusted with a crucial mission—to infiltrate the Demon King's castle. However, due to the schemes of a certain individual, the mission ends in failure early on, leading to Coral's capture and imprisonment within the castle. There, Coral witnesses the gruesome aftermath of a war triggered by the uncontrollable magic of the Demon King's son, Prince Aries. "If only I could redo this mission from the start... If only I could stop the prince's rampage..." With that desperate wish, Coral comes into possession of the Chronicle of Time, a book that grants a single opportunity to return to the past. As Coral embarks on the mission once more, an unforeseen truth comes to light—one that reveals a hidden side of Prince Aries that no one else knows…!