Isaku never wished to inherit the role of a yakuza boss's daughter, but fate had other plans. At the age of five, her parents perished in a car accident, leaving her under the care of her gangster grandfather, who raised her within the clan. For years, she endured isolation from her peers due to her family's reputation. However, Isaku is now determined to step into high school, experience a normal life, and perhaps find love.
Her plans take an unexpected turn when her loyal family servant, 26-year-old Keiya, also enrolls in high school with the sole mission of safeguarding her from the challenges of school life and matters of the heart. Now, not only does Isaku have to navigate the complexities of high school, but she also has a chain-smoking, gun-toting guardian to contend with. What's a young lady to do amidst these unique circumstances?