Arata, a young boy from a noble family in Amawakuni, has always expected to make life his own—until news of the princess’s weakening condition reaches his city. Unbeknownst to him, his grandmother had declared him female at birth, and now, with no other girls available to succeed the princess of the matriarchal Hime clan, he is next in line for the throne! Disguised as a woman while awaiting a replacement, Arata witnesses an assassination attempt on the princess by none other than her own guard, the 12 Shinsho. The crime is pinned on him, forcing Arata to flee to the Kando forest, where it is said that no one emerges unchanged. Meanwhile, in modern-day Japan, Arata Hinohara longs to escape the cruelty of his classmates. Hearing his name called from an alley, he strays from his path and unwittingly switches universes with Arata from Amawakuni. With his own power as a newly awakened "Sho"—a warrior able to wield Hayagami, weapons imbued with the power of the gods—and the help of companions he meets along the way, Hinohara sets out to restore order to this new world.