Overpowered Reincarnation

A young man who dies so a random woman could live gets reincarnated as an overpowered demon queen. Asuna the demon lord who brought her back to life thinks it's the demon queen, but it's the young man. Knowing that telling Asuna the truth of who she is would hurt her she decides to act like the real demon queen and keep the secret. This is the story of a young man who became a beautiful and overpowered demon queen.