At the age of twenty, Kanze Zenjiro's bloody footprints mark the bodies of those who stood in his way to protect the throne of his beloved nation of Nihon. Now, the tyrannical Iberian Empire is bent on destroying his kingdom, and they are sure to send their steam-powered giants and iron spiders against him. Zen embarks on a quest that takes him on the most dangerous journey of his life. To succeed, Zen must live up to his nickname, the Dragonfly Warrior, and kill all his enemies with only a sword and a pair of six-guns and somehow survive a test of faith and loyalty in a world so cruel and merciless, it borders on madness.