Nagisa

One of Chiaki's besties and gyaru of the group.
She is the one that ends up taking Nao's virginity.
One of the more sexually active of the trio as she has sex-friends ontop of a regular boyfriend (she doesn't consider having sex-friends as cheating).
She later has a threesome with Nao and Yukiko.

At the conclusion of the story, she breaks up with her boyfriend and proposes that she and Nao start dating with the intention for marriage.