What's the name of this manga?!?!?! Please Help!?

It's a shojo romance comedy manga about a girl who meets a boy named leo who looks really scary, but in reality is just a timid and very kind immature teen. It turns out he came from the jungle, and he has a [panther? crocodile?] tooth on a necklace around his neck. I would really like to re-read this manga since it was so good, but I can't remember the title!! HELP!!