The young ninja Kagetora has received a significant honor: serving a prestigious family of accomplished martial artists. However, upon his arrival, he is assigned a demanding task: to instruct the family heir, the charming yet clumsy Yuki, in the agile techniques of self-defense and combat. Yet, Yuki's struggle to master martial arts is not what makes this position so arduous for Kagetora. No, it is Yuki herself. One day, she will inherit her family's dojo, and for a ninja like Kagetora, falling in love with his master constitutes a betrayal of his duty, the ultimate dishonor, and is strictly forbidden. Will Kagetora help Yuki overcome her awkward nature... or will he be overwhelmed by his growing feelings?