"KageTora" is a romantic comedy manga series that centers around Torao Kageyama, a young ninja from the Kageyama clan, who is tasked with protecting Yuki, the granddaughter of his clan's leader. The Kageyama clan has served the Tenjoin family for generations, and Torao's mission is to ensure Yuki's safety while keeping his ninja identity a secret. Torao, despite his ninja training, is socially awkward and struggles with modern life, often leading to comedic situations as he tries to blend in as a high school student.

Yuki Tenjoin is a cheerful and kind-hearted girl, but her naivety and trusting nature often put her in precarious situations, requiring Torao's intervention. As Torao works to protect her, he gradually develops feelings for Yuki, complicating his role as her guardian. The series explores their evolving relationship, balancing moments of humor, action, and romance. Torao's ninja skills are frequently put to the test as he faces various threats, ranging from rival ninja clans to everyday challenges that arise from his inexperience with modern society.

The narrative also introduces a supporting cast of characters, including other members of the Kageyama clan and Yuki's friends, who add depth to the story. Rivals and antagonists occasionally emerge, creating tension and driving the plot forward. The series maintains a lighthearted tone overall, with occasional dramatic moments that highlight the stakes of Torao's mission and his growing emotional connection to Yuki. Through its blend of action, comedy, and romance, "KageTora" presents a story of loyalty, personal growth, and the complexities of balancing duty with personal feelings.