During the Battle of Sekigahara in 1600, Toyohisa Shimazu serves as the rearguard for his retreating forces. He is critically wounded when he suddenly finds himself in a modern, gleaming white hallway. Confronted with only a stoic man named Murasaki and hundreds of doors on both sides, Toyohisa is pulled into the nearest door and into a world completely unlike his own. This strange land is populated by all manner of fantastical creatures, as well as warriors from different eras of Toyohisa's world who were thought to be dead. After quickly befriending the infamous warlord Nobunaga Oda and the ancient archer Yoichi Suketaka Nasu, Toyohisa learns of the political unrest tearing through the continent. Furthermore, they have been summoned as "Drifters" to fight against the "Ends," people responsible for the creation of the Orte Empire who are trying to annihilate the Drifters. As the Ends grow more powerful, so does the Empire's persecution of elves and other demihumans. It is up to Toyohisa and his group of unconventional heroes to battle in a brand-new world war to help the Empire's subjects, while challenging the Ends protecting the land to claim it for themselves.