The new shonen action manga from the creator of Magi is here! Musashi is a teenager living under demon rule. As children, he and his best friend made a promise: to become the greatest warriors in the world and overthrow the demons. But life intervenes, and five years later, he finds himself about to become a miner. Yet can Musashi truly be satisfied with a "normal" life?THE OBSIDIAN GODDESS At the Great East Mine, Kojiro and Tsugumi face an attack from the mysterious swordsman Shiro Inukai, whose sole objective is to steal demon metal blades. Musashi escapes from the abyss and rushes to their aid, but the three friends can’t hold a candle to Inukai’s strange abilities. Just then, the Obsidian Goddess’s power awakens within Musashi! Now’s their chance to launch a counterattack!