Based on The 9-nine- series (Nine Series), an episodic bishoujo adventure Visual Novel series composed of 4 episodes (9-nine- Kokonotsu Kokonoka Kokonoiro, 9-nine- Sorairo Sorauta Soranooto, 9-nine- Haruiro Harukoi Harunokaze, and 9-nine- Yukiiro Yukihana Yukinoato) created by Palette.
