Kyoko Himeji

A friend of Kouda's who is the first person that the girls know in their age group who loses her virginity. She is assumed part of Eriko's "Moron Group" much to her chagrin. Himeji is often flippant in her sex life, letting guys get the better of her. She used to be overweight, but her crush on Odagiri gave her the incentive to lose weight.

(Source: Wikipedia)