Venus to Mamoru

is a Japanese light novel series written by Taro Achi, with illustrations by Kanao Araki. The series began publication on September 10, 2003 by ASCII Media Works under their Dengeki Bunko publishing imprint.

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

Yoshimura Mamoru is a high school boy who was saved by Beatrice miraculously when he was a child. At the first day of the school, he meets a girl under the cherry trees on his way to the school. She orders him to go out with her.

Her name is Takasu Ayako. She is in the second grade and one year older than him. She is a director of student committee of discipline. Also, she is a granddaughter of a big-name politician, very beautiful, and a genius Beatrician who can even shoot a satellite down. She is called Witch Beatrice or Death Angel in Beatrice, but in fact, she is a pure-hearted girl.

Venus to Mamoru!
An anime adaptation of the light novel. It aired for 24 episodes between October 6, 2007 and March 30, 2008.