Natsukashii Mirai ~longing future~ (懐かしい未来 ~longing future~) is alan's 3rd Japanese single released on July 2, 2008. The title track was used as the theme song for the special NHK TV program, Save the Future, which was aired for three days around World Environment Day on all NHK channels and on the web to raise awareness of environmental issues prior to the 34th G8 Summit hosted by Japan. In particular, it was the theme song for a TV movie included in the program, Boku no Shima / Kanojo no Sango (僕の島/彼女のサンゴ; My Island / Her Corals).