Harukanaru Toki no Naka de 4

The 4th installment in the Haruka otome series. The protagonist is one of two princesses of a prestigious kingdom stationed in a land called Nakatsu Kuni within the parallel world. During her childhood, the kingdom was invaded by forces led by the king of Tokoyo no Kuni, a distant rival land connected to her kingdom. As Nakatsu Kuni is quickly overwhelmed, a divine power sends the protagonist through space-time to the modern world, protecting her from her kingdom's slaughter and ruin.