I think there's 2 cultural misunderstandings here.
1. As far as I know, kissing as a greeting is only common in France (or French-speaking regions), and only among family or very close friends. It's probably done elsewhere too, but is not very common anymore.
2. Kissing as a greeting is done cheek on cheek, not mouth to mouth.
But it's a common misconception in Japan, which is why it's often used as a joke or excuse in manga.