Kakusei Idenshi

is a Japanese light novel series written by Hajime Nakamura, with illustrations by refeia. The series began publication on May 10, 2010 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
In a city where sleeping sickness spreads quietly, Tsukio sees a girl in a dream every night. She always sat on a simple sleeper and stared at me. However, at the same time that something happens to such a dream, Tsukio meets the girl in reality.

The girl's name is Tsetse. Tsukio, who was nostalgic for her awakening from sleeping sickness that should not wake up, is attracted to her innocent Tseze. Sleep, dreams, angels, genes, and many other things are intertwined, and what is the fate of waiting for them?

"──Is it really okay for me to wake up?"

The moving Angelic Symphony opens.