Dual Soul Reincarnation

Martin Wind was one of the top fighters in the US. Fight fanatic he was, he kept searching for new challenges and new heights, only for his career to eventually end in disaster. That was his old life. Having died, fully prepared for the aftermath it might hold, he was still shocked to find himself sharing body and mind with a princess in some fantasy world.
Zirana Nara, crowned princess of the unified human kingdoms, is trying to balance the delicate economy of eleven kingdoms, the demonic possession plaguing humanity, and the tumultuous relationships with the neighboring nations of the Reptillians and Draconic-Elves. This grave burden is added onto further when she finds herself sharing her mind with an unknown entity claiming to be a human from another world.
Without a clear solution, these two find themselves working together to protect her people and save each other from their past regrets.