Lain Iwakura's homeroom teacher, is a minor character who appears in episode 1 and episode 8. She has very few lines.
|Affiliation||Ouka Private Girls' Academy|
|Location||Ouka Private Girls' Academy|
Her name, Yoshii Keiko (吉井恵子), is only known because it appears in the credits.
Serial Experiments Lain @wiki mentions her on this page (Japanese).