Maxi single containing the intro theme to the PlayStation game "Sister Princess," performed by the 12 voice actresses who play the heroines; Natsuko Kuwatani, Hisayo Mochizuki, Yumiko Kobayashi, Yui Horie, Chiemi Chiba, Ryoka Yuzuki, Kumiko Yokote, Chiro Kanzaki, Ayako Kawasumi, Tomoe Hanba, and Nana Mizuki.