Weak-kneed Teacher

Yowa Yowa Sensei follows Akihito Abikura, a 2nd year high school student who is intimidated to discover that he's been assigned to the class of Hiyori Hiwarimura, a notoriously scary teacher. However, Akihito soon discovers that Hiyori isn't actually scary, she's just extremely shy. (Source: Crunchyroll News, edited)