A book has been published by MF Books.

"—How absurd."

Rio, a boy living in the frontier, grew disillusioned with the village dojo's teaching philosophy and abandoned it.

However, to survive in the dangerous frontier, he needed to master some kind of martial art. So, Rio began to create his own original sword art.

Despite being told he had no talent, Rio immersed himself in creating his sword art, even completing its ultimate technique.

Unaware that this ultimate technique would eventually change the world—

This work is also simultaneously posted on Kakuyomu.