the fourth game, "onimusha: dawn of dreams", had nobunaga's servant hideyoshi toyotomi unified japan with the genma whom he supported in their actions. his illegitimate son, hideyasu "soki" yuki, goes on a quest to defeat hideyoshi and stop the genma. he is aided by several other warriors including an elder samanosuke who recognizes him as the black oni, the god of darkness. after mastering his oni powers, soki joins with his friends to defeat hideyoshi's army. in the aftermath it is revealed that hideyoshi was a puppet of the genma triumvirate who wish to resurrect fortinbras at his full power as the genmas' god of light. although the genma triumvirate and hideyoshi are defeated, fortinbras resurrects with soki using the oni gauntlet to destroy the genma and restore the country's peace at the cost of his life. soon after, samanosuke embarks on a quest to seal away the oni gauntlet to prevent nobunaga from being released.