"Don't You Know?!" is Rumi Shishido's ninth single. It was the first ending song used for the Gokinjo Monogatari anime. The CD included, "Naide Nanka" and was released on October 21, 1995.
The song was later included on the first and second soundtracks, and Gokinjo Monogatari Zenyouku Shu. The single's lyrics were written by Miyu Yuzuki, Miki Matsubara composed it, and Tadamitsuhiro arranged the song.
Gokinjo Monogatari ending 1