Rena Nakano

As the biological mother of the Nakano quintuplets, this former high school educator was deeply respected by those she taught, including her former student, Shimoda. Though she commanded great admiration, she was defined by a remarkably stern and disciplined persona. Known for being unsociable and strictly serious, she maintained an iron-fisted approach to classroom management, frequently employing harsh sanctions to ensure her students adhered to her rigorous academic standards.