Boys Be Princess

The time is the distant future, where the "Trisyceltis Empire" boasts such power that it is said to control approximately 50% of humanity. In such an empire, a boy named Ardy who happens to be present during a hijacking finds his brain transplanted into the body of the imperial princess through a twist of fate. What destiny awaits him, who has now become a member of the imperial family and has become a woman...