In the post-apocalyptic Junkyard, a mysterious religious order known only as the Church watches over the brutal competition between warring tribes as they vie to unify six territories and thereby gain access to Nirvana, the promised land. In the wake of one particularly unusual battle, Serph, the leader of the upstart Embryon tribe, rescues a strange girl and discovers that he and his fellow fighters have gained the ability to transform into terrifying demon warriors. But these new abilities, along with this enigmatic girl named Sera, threaten to upend the balance of power not only in the Junkyard, but within the Embryon itself. Avatar Tuner, Vol. I opens the Quantum Devil Saga, a series inspired by the Shin Megami Tensei video games, which are widely popular in their native Japan and have gained a considerable following in the West. Translated into English for the first time, experience the story of Serph and his tribe as they fight not only to win, but to understand the supernatural forces that govern the Junkyard.