Asian Kung-Fu Generation - Mustang (Mix for Meiko)
Reading Solanin (the manga) while listening to this makes me cry all the time. Such a beautiful song.
AKG Fun fact:
This mix was released as the B-side to the Solanin Single. The lyrics to Solanin (the song) were written by Inio Asano (the author of the Solanin manga) and the original version of Mustang was the ending song to the Movie adaptation of the manga. The reason for the title being “Mix for Meiko” is that Meiko is the name of the female protagonist of Solanin.