In the midst of the raging war between the Human Empire and the Dark Territory in Underworld, Gabriel, embodying the Dark God Vecta, leads his army in a relentless pursuit of Alice, the Priestess of Light. As Kirito lies dormant, thousands of American players join the fray at Gabriel's command. On the opposing side, Asuna, Sinon, and Leafa enter the battlefield with formidable super-accounts granted by the deities of Underworld. As the Goddess of Creation Stacia, Asuna clashes with the American players alongside the Human Empire forces. Sinon, empowered by the Sun Goddess Solus, seeks to rescue Alice from Gabriel, while Leafa, as the Earth Goddess Terraria, makes her stand. Lisbeth's rallying cry sways ALO players to ally with the Human Empire, risking all in this monumental conflict. Beyond the fate of Underworld, the very essence of artificial intelligence, the ultimate AI, and the future of humanity hang in the balance. Amidst this chaos, the dormant Kirito, known as the Black Swordsman, remains the key to the world's destiny.