Eiai Nano is practical to a fault, obsessed with solving a problem in the most efficient way possible no matter what. She is a 1st year, class 4 student at Ohananomitsu High School. Eiai has memorized hundreds of digits of Pi, which she sometimes uses to calm herself down. Due to her extreme intelligence and efficiency, in most difficult situations, Eiai is the first to come up with solutions. However, her solutions are sometimes brutal due to her lack of social experience.