This OVA isn't here to explain Kingdom Hearts to you, it's here to break the thing you thought you understood. The Master of Masters is gone before you can even ask what he wanted, leaving six people holding pieces of a plan none of them fully grasps. You watch them try to lead their Unions toward a war they can't prevent, each one certain they know the real reason they were chosen.
Before Keyblades became legend, seven masters stood at the dawn of light itself. In Daybreak Town, an age of miracles thrives around these chosen wielders and their apprentices, all bound by weapons forged from pure will. But this golden era carries a dark shadow. The Master of Masters has glimpsed a catastrophe on the horizon, a conflict so devastating it threatens to swallow the world whole. To prevent oblivion, he divides his followers into distinct Unions, each bearing a separate mission in the coming darkness. Then, without warning, he simply disappears. His apprentices are left holding fractured prophecies and incomplete instructions, forced to lead armies of Keyblade wielders across Daybreak Town while wrestling with questions the Master left unanswered. Trust becomes currency. Loyalty becomes burden. What unfolds is a story of friendship tested by fate, where six disciples must decipher their master's cryptic final lesson before an unseen enemy reshapes everything they've sworn to protect. This OVA rewrites the Kingdom Hearts mythology from its genesis, revealing the truth behind the power that echoes through all worlds.