Mana's Older Sister
She's fiercely protective of her younger sister—the kind of person who needs convincing before she trusts someone new in Mana's life. Kazu had to earn her approval, but once he did, she accepted him as Mana's partner pretty quickly after that.
What's interesting is that she wasn't really into sex before meeting Kazu. It wasn't until Mana basically pushed her to try it with him that she actually gave it a shot. Fans often note how her whole attitude shifted once she experienced it for herself.
Content compiled by AnimeList.moe from publicly available sources.
