Kurusu Tomari♀

Kurusu Tomari is a student at Kashima high school and is a classmate of Hazumu's in their second year. Tomari is also Hazumu's childhood friend. Hazumu would often get bullied as a child, and Tomari would have to come to his rescue, saying that she would protect him forever. Tomari is very athletic and competitive, so in high school she joined the track and field club. In contrast to Hazumu and Yasuna who are not athletes and rather feminine, Tomari is a tomboy who does not often partake in traditionally feminine things such as clothing, shopping, or cosmetics. At least two of Tomari's female friends on the track team consider her very masculine, and like her cool character; one of these friends even says that if Tomari were a boy that she would have a huge crush on her.

[From Wikipedia.]