Kaitoko

In a certain kingdom, one knight among the new recruits is a little different from the rest. He possesses a special magic ability called "kairaijutsu" (puppetry magic) thereby manipulating his own body, and is always protecting his friend who's often mistaken for a girl. But the truth is—he is the one who's actually a girl! Not only his gender but his age, social status and even health are all falsified too!