The King's Beast manga volume 10 features story and art by Rei Toma.

Sogetsu may have been released from the emperor’s cruelty, but he’s not yet completely free of his ordeal. In order to survive the experiments he suffered through, Sogetsu’s mind splintered into many personalities... and only one of them made it out of the inner palace. Now he is racked with guilt over being the wrong Sogetsu, and the agony of feeling unworthy of being rescued is pushing him into unexpected action!