Onegai My Melody Clip

The girl has a breakdown of some sort and the hole student body gets switched around; the main character's male friend gets a female body from the neck down (I think, at least boobs and hips), while his friend ends up with some girl's hair. After the breakdown, the girl ends up with the form of a super hot older girl.

The older man who suddenly ends up with breasts and longer hair is the main characters father.

Pic 1: Boys notice some changes Pic 2: Girl with her older/taller/bustier appearance