Natsu Yuuzora

"Natsu Yuuzora" (夏夕空) is a song performed by Kousuke Atari for the 2008 television anime Natsume Yuujinchou (Natsume's Book of Friends). It was used as the series' ending theme in the Brain's Base adaptation.

The song was released as Atari's sixth single on September 3, 2008. Yuko Kawai wrote the lyrics, Miki Watanabe composed the music, and Sin arranged the track. It also appeared on Atari's 2008 album Kizuna Uta (絆歌) and later on the Kizuna/Natsu Yuuzora - EP released on September 24, 2008.