Supergirl: Hoshi to Hana

in 1539 a starship from the lost world of krypton lands on earth in Nippon. The four year old girl inside found is found by the iga-ryu and trained to become one of their best Kunoichi. When the Kunoichi Asuka makes a prediction, the Iga send a to the Mino Province where she is adopted by Saito Dosan and raised as Kicho's sister. In 1549 Kana follows her sister into the service of Oda Nobunaga. it is now the year 1551 and Oda Nobuhide has passed away, but not everyone prefers the heir Oda Nobunaga. Kana however has promised her sister to help her brother-in-law unify Japan, for peace. Will a girl from the stars be able to help alter the course of History? and create a fully unified Nippon? Will she keep her promise to her sister when her heart pulls her in another direction?