Noriko Mizushima  

, 水島 紀子

In fourth grade at St. Miator School, there is a member of the Kyuudou club named Nagisa Ichigo-sha. She lives next door to Tamao and they are friends, which means she sometimes attends their secret tea parties. Nagisa's roommate in college is Chihaya Takemura, who has been her classmate since kindergarten. They have known each other for about 12 years, as calculated by Tamao, and Nagisa compares their relationship to that of a married couple in episode 3.