Hamamura Nagisa no Keisan Note

In a startling shift in national policy, mathematics has been entirely removed from the school curriculum across Japan. This controversial decision sparks fierce opposition, culminating in the emergence of a radical organization known as Black Triangle. Refusing to accept the erasure of mathematical education, the group escalates their protests into outright hostility, issuing a dire threat to the government: if their demands are not met, they will seize control of the entire country. Faced with an unprecedented domestic crisis and the looming prospect of a hostile takeover, law enforcement is forced to take drastic action. The police assemble a specialized team dedicated to combating Black Triangle and neutralizing the threat they pose to national security. However, this newly formed unit is far from ordinary. Among its selected members is a junior high school girl, thrust into a dangerous conflict that bridges the gap between academic ideals and life-or-death stakes. As the organization's ambitions grow bolder, she must stand alongside seasoned officers to protect her nation from those who believe mathematics is a cause worth fighting for.