Risai is the general of Tai's Jou Province and well-known, though she is not as renowned as Gyousou. When Taiki's return to the Twelve Kingdoms is announced, she is among the many who ascend Mount Hou in hopes of being chosen as the new king. She is a sennin as a result of becoming a general of Jou since the governor of Jou, who has a lived a long life, requires those who serve him to also possess longevity as well to retain their usefulness. Taiki develops a friendly relationship with her, but in the end does not recognize her as Tai's new king. After Gyousou ascends the throne of Tai, she remains a loyal subject.

When Taiki and Gyousou both mysteriously vanish during another civil war, she and military commanders and civil servants oppose the governor who places himself in charge of the kingdom. While many are arrested, Risai is among the few who successfully escape arrest and continues to search for Gyousou and Taiki. She eventually flees to Han and then finds refuge in Kei, where she beseeches Youko to somehow find either Taiki or Gyousou in order save Tai from a corrupt and totalitarian rule by a usurper whose rule violates the Mandate of Heaven.