Nanase was born to the
main house of the Mizukami family, growing up with her beloved elder sister
and role model Hokuto.
Although born to a family of kobujutsu masters, Nanase only trained to
maintain the tradition and actually dislikes her training, slipping out
whenever she gets the chance. However, Nanase avoids cutting training as much
as possible in order to not upset her sister. In spite of her reluctance to
train, Nanase is a skilled master of bojutsu.
One day, Nanase was
surprised by Hokuto's sudden decision to forsake the title of Seiden of
the Mizukami Ancient Art of Jujutsu and handed it down to her. Not long
afterward, Hokuto disappeared and set off on a journey to fight a new enemy.
Nanase later learned that Hokuto was in fact, searching for their long-lost
elder brother Kairi,
and went on a trip to prevent the two from fighting each other.