|Manga Debut||Volume 4, Chapter 2 (mentioned)|
|Anime Debut||Season 2, Episode 1: Seniors!|
Mika Itō (episode Drummer!)
Keiko is a member of the school's Basketball Club and a close friend of Ushio Ōta and Nobuyo Nakajima. She loves to chat and gossip. Keiko follows every new fad and also goes to pop idols' concerts a lot.
Keiko has shoulder-length brown hair, which is combed aside, showing her forehead. Her bangs are decorated with two black barrettes on each side. Hey eyes are brown. As a Sakuragaoka High School student, she is usually seen wearing the school's uniform with white socks. Her blazer is mostly unbuttoned and she usually wears the summer waistcoat under it too.
- In the second chapter of Volume 4 of the manga, a member of Class 3-2 called Iida (飯田) was a candidate for the second leading role of the class play "Romeo and Juliet". The anime adopted the name and invented the actual character, as Keiko can't be seen in the manga.
- Keiko managed to get two votes in the manga. It's unknown if she got the same amount in the anime adaption.