Fresh out of high school, 18-year-old Miu finds herself in a quiet afternoon tutoring session with her uncle, a man she's always admired for his intellect and charm. As they review algebra equations, Miu's mind wanders, her gaze lingering on her uncle's strong hands and the way his lips curve when he smiles. Unbeknownst to her, her uncle notices her distraction, and his own thoughts begin to wander into taboo territory. As the session progresses, Miu's uncle starts to guide her through more than just math, introducing her to the complex equations of desire and the tantalizing world of carnal pleasure.