Zessei Shoujo Defensol

is a Japanese light novel series written by Maki Masato, with illustrations by Kazuyuki Yoshizumi. The series began publication on December 10, 2005 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
"Suddenly, you become my" King "," Shin Hatachi makes an unexpected confession to Yuina Amane, who transferred to school a month ago. She calls herself "Boundary Guardian " and wants Shin to become her own "King " ... With that as a trigger, an incident comes to peaceful days. A mysterious group called "Tenjo Gekidan ", a duo of black and crimson who suddenly attacks. What is the King of the Gate, what is the Boundary Guardian, and what is the enemy "Daybreak" coming from a different area? The hot and runaway three days of July are about to begin.