The final act was set at the annual "Day of Unity," where the King would give a speech condemning the "Shadow Demon" and his rebels. Haruto and the Guard didn't plan to attack. They planned to replace the King's prepared speech.
As Alistair stood before the nation, the massive, embroidered banner behind him cast a shadow on the wall. Haruto, hidden nearby, merged with this shadow. When the King began to speak, his voice echoed from his lips, but the shadow on the wall moved out of sync, its mouth speaking the true words of his pact with Vorlak. The King stood frozen, his own shadow betraying him as it reenacted the secret signing ceremony. In the ensuing chaos, a conflicted Yuto,
his will broken by Haruto's campaign of doubt, hesitated to defend his father. This hesitation was all the proof the royal guards needed.
Seeing their hero's uncertainty, they stood down.
King Alistair the Third was arrested not by rebels, but by his own palace guard for high treason,
his power broken by the very shadows he had sought to banish. Haruto had won not by becoming a king, but by forcing the kingdom to see the truth.