Maicching Machiko-sensei (2000)  

Miss Machiko, まいっちんぐマチコ先生

The show follows Miss Machiko, a new elementary school teacher who frequently finds herself in unintentional sexual encounters. Despite wearing a red mini-skirt, she is well-liked by her students, particularly the boys, who enjoy lifting up her skirt and setting traps to catch her in various stages of undress.