Stream Onmyoji: The Yin Yang Master Online Free – Watch Full Movie from Home at 123Movies. . During a dark time in the Heian period, when evil forces threaten the kingdom, the emperor relies on the Onmyoji to keep the supernatural forces in line. But as political events become highly charged, friction within the order leads to betrayal. Now, Seimei (Mansai Nomura), a talented member of the clan, must face down his master, Doson (Hiroyuki Sanada), in the hopes of restoring peace to the kingdom.