Orient manga volume 15 features story and art by Shinobu Ohtaka, the creator of Magi.

The reassembled Obsidian Eight have launched an all-out assault on the Land of the Setting Sun. After speaking to Lord Hojo, Musashi and his friends learn that their best hope may lie in special black blades forged from the body of a demon god. And so, Musashi and Kojiro set off on a perilous journey into the bowels of the earth itself in search of precious dark metal.