Following a one-month suspension, Niizuma Tomoki finds herself reassigned to the Special Investigations Counter-Measures Unit, a basement division with only two other members. The fate of law enforcement rests on the shoulders of Mikoshiba Gakuto, a youthful and attractive mathematician who evaluates cases objectively through numbers. Through his mathematical prowess, he illuminates the intricacies of the human psyche, unraveling truths with precision and elegance.