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? With the battle to reclaim Awaji Island quickly approaching, Musashi throws himself into his training with Amako to learn to link up his blade energy. Things start looking up when Michiru lends a hand, but suddenly she and Musashi are enveloped in a huge obsidian crystal. As events spiral out of control, the secret of Michiru's past comes to light!