Guided by prophetic visions, Jeanne Kaguya d'Arc escapes alongside the genius Leonardo da Vinci from the West Star to the East Star to locate the King of Salvation. There, she crosses paths with Nobunaga Oda, a determined young lord aspiring to conquer the world after a devastating defeat. Recognizing Nobunaga as the prophesied King, Jeanne pledges her loyalty to the Oda clan. Meanwhile, King Arthur dispatches the formidable general Gaius Julius Caesar and his mechanical army to conquer Nobunaga's realm and claim the Holy Grail. Despite Kaguya's belief that Arthur is the King of Destruction, doubts arise about Nobunaga's leadership as he recklessly engages in battle in his self-named combat suit, 'The Fool.' With the support of Himiko, the Queen of Yamato, Nobunaga and his allies face internal strife, external threats, and the weight of destiny as they strive to save their world from impending doom.