Birthday: 28th September Akiko Sengenji became Yano's classmate when he transferred school in Tokyo from Hokkaido leaving Nanami behind. She had grown feelings for Yano even though Aki-chan knows that Yano loves Nanami, and he just sees her as a friend.
She could not bring herself to confess her love for Yano. Aki also became close friends with Yano. She is the only one Yano can rely on during his times of hardships. And later on becoming friends with Nanami and Takeuchi as well.