Zodiac: Libra
Kou's basically a lifelong gamer who kept to herself until Nao—Hirotaka's little brother—randomly asked her to teach him one of her games. That single interaction kind of changed things for her. She's not great with social stuff yet; talking to Nao still makes her nervous, and she has this habit of apologizing constantly even when there's nothing to apologize for.
She dresses pretty masculine, so people often mistake her for a guy. Whether Nao actually realizes she's a girl is kind of up in the air—it's never really been made clear.
Content compiled by AnimeList.moe from publicly available sources.
