Queen of Yesterday

In the far away Empire of Momua, a legend has always been told about the Queens of Yesterday- the three unassuming sisters who ran away and formed their own safe haven for girls and women at a time when the whole world was against them, and training them to become killer machines.
Of course, it was just a legend.
But May, living almost a hundred years after the three princesses, is soon to find out that every myth has a grain of truth and although her society has improved in the years since the Dark Times of the princesses... it has a long way to go, especially when her family is taken from her and the only people who take her in are the supposed enemy.