Height: 157 cm

Segawa Izumi is the chairman of her class. She is the younger fraternal twin sister of Kotetsu Segawa. Hayate saved her from an attack from a dog, which stole her doll when they were young. She rewarded him with a kiss on his lips in return which got her father worried. They had never mentioned to each other about the incident since they first met in Hakuō Academy as time had blurred their image of each other during childhood.