「Solanin (ソラニン) – ASIAN KUNG-FU GENERATION」Wiki
"Solanin" (ソラニン?) is the 14th single of Japanese rock band Asian Kung-Fu Generation, released on March 31, 2010. The first track is the main theme for the movie Solanin, based on the song from the manga of the same name. The lyrics were written by Inio Asano and are taken from the manga itself. The song was also added as an extra track on the album Magic Disk. The second track serves as the ending theme of the movie and is a remix of "Mustang," from their 2008 EP "Mada Minu Ashita ni", which was also inspired by the manga. This remix features in the band's compilation album, Feedback File 2.
(Wikipedia contributors. "Solanin (song)." Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, 5 Feb. 2014. Web. 28 May. 2014.)