Black Knight to Bara no Toge

is a Japanese light novel series written by Tosei Tamura, with illustrations by Yukino Aoi. The series began publication on July 10, 2003 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
A message reminiscent of a suicide notice was written on the website operated by the IT research department of the high school to which Yuichi Kurosaki belongs. Though thought that it might be just a mischief, Yuichi, who had a deep exchange on the Internet, decides to find the sender of the message, Ai in the sky. Yuichi, who started his search by relying on a faint clue, meets a regular on the bulletin board, Rose Thorn, who is also trying to find the eye in the sky. And they cooperate and try to find the eye in the sky ...