I am looking for an Asian movie i watched? I don't remember the title. Help?

A Few years ago, i watched an Asian movie. i don't remember the title.
i think it was a Japanese movie.
It was about the hottest guys in a high school and they get flowers
and stuff. Then one day they get slimmed. And That's is all i can
remember. Sorry, i couldn't tell you the rest cause i don't remember.

Plz!!!! Help!!!