DNA² (1994)

A time traveler goes back to present day Japan to prevent super-lover from being created and later taking over the world. What she does find is a nerdy boy who literally vomits whenever a girl arouses him. She shoots him with a special chemical coated dart in order to prevent the potential personality magnetism from emerging, only to learn that she has created it in him instead. Now she must work with the guy to prevent the evil seducer side of him from becoming dominate, without herself falling for him in the process.