Crystal Communication

is a Japanese light novel series written by Yukiya Akatsuki, with illustrations by Poporucha. The series began publication on June 10, 2003 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
"Would you like to have lunch with me?" "I don't mind, but why with me?" "Because it's crystal-colored" "Sui ...?" "Because you're crystal-colored, I want to share time with you." When I met a mysterious girl at the university entrance exam, I didn't realize that "something" had begun from that moment. The girl calls herself Kay, and, to her surprise, has a mysterious power ...! A mysterious love story appears.