Yumiko Kusaka

Girl #7 is an athletic tomboy and Yukiko's best friend. She has a crush on Shuuya, but does not want to admit it to Yukiko, since Yukiko likes him, too. On the island, she and Yukiko decide to use her megaphone to call the other students and discuss things as a group. However, this attracts the attention of Kazuo Kiriyama, who quickly dispatches both of them. (Source: Wikipedia)