Natsuki Sonomura

A friend from Yuu, Koyomi, and Akari's middle school days. She was the one who invited Yuu to join the softball team in middle school and went to a different high school to continue playing softball. She owns a Shiba Inu. During Golden Week, she once went out with Yuu and the others, and during summer vacation, she coincidentally met Yuu and accompanied her on a shopping trip for a training camp. During this time, Yuu complained to Natsuki about being pushed around by Touko, and Natsuki pointed out how much Yuu had changed compared to her middle school days. In the final episode, she participates in the cultural festival at Tohmi East High School with Koyomi and Akari to see Touko.