Kasumi

Kasumi summary:

Kasumi is a special girl-and not just because she's a super-cute high schooler with a heart of gold. She has a major secret: She can turn INVISIBLE when she holds her breath. But when she transfers to an elite private school, it gets harder to keep her superpowers secret, especially when she catches the eye of the handsome student-council president, Ryuuki, and becomes the target of his number one fan, mean girl extraordinaire Reina. Can Kasumi keep hiding who she really is?