There's going to be a new student in Tesukayama School. To everyone surprise, that student is a girl, a ninja girl. Her grandparents died and she's the only one left in her ninja clan. Kyuutarou never been in a city before, all of her life she's always live in the jungle. She never go to school, her grandparent is the one who teachs everything.

Motoi whose his dad is also the school director is asked by his dad to take care of her and because of his family and Kyuutarou's family's relationship back in the shogunate era, Motoi's dad have to adopted her to live in Motoi's family. To complicate things more, there are ninja from other clans that try to hunt Kyuutarou down. What, more ninja? How the outcome of this chaotic story will be unfolded?