Venus to Mamoru!

is a Japanese light novel series written by Hiroki Iwata and illustrated by Toshiyuki Satō that was first published on September 25, 2003 by MediaWorks. An anime adaptation was broadcast on WOWOW from October 6, 2006 to March 30, 2007 and ran for 24 episodes.

Plot
"Beatrice". It is a mysterious power that responds to people’s will and realizes all of them. Tokyo Beatrice University Attached High School is the only school that teaches Beatrice called "magic appears in the real world".

Mamoru Yoshimura gets accepted into a prestigious high school for students endowed with the power of Beatrice due to his high intellect. Right after first entering the school on his first day, he meets the mysterious Ayako Takasu, also known as the Beatrice's Angel of Death, who is a pretty and popular female student whose powers exceed most others. Moments later, Ayako, who has never been known to show a smile, suddenly confesses her strong feelings for Mamoru, despite having never met him before. That same day, he is brought in as a member of the student council as Ayako's side as he becomes involved with the dangers and mysteries related to the power of Beatrice.

Other Sources

 * Anime