After an ancient virus reawakens, humanity gains the ability to bond with Beast Souls, unlocking primal powers through ordinary objects known as Tools. Kazuo Rengai, a 15-year-old with no known affinity, inherits a chaotic Tool—a folding knife tied to the soul of a prehistoric Chimera.

Kazuo enters Yatagarasu Institute, a prestigious school for training elite Mechanics, where students wield Tools to battle rivals and prove their worth. Assigned to the Claw Unit, Kazuo faces tough challenges and dangerous enemies, all while unraveling the mysteries of his unstable Tool and its ancient origins.

As Kazuo grows stronger, he discovers a conspiracy involving rogue Mechanics and the elusive "Prime Tools," setting him on a path to uncover his true potential and confront an impending threat that could reshape the world.

renga canon

Toolbound: Legacy of the Beast