This is the sad theme that is played whenever the plot is around Orpherus, in the anime (when he thinks of his dead sister, etc). As in the anime, I made 2 versions of it. This one is played by a sextet.
According to the OST, the title is "Quaerens Me" (track 26), composed by Yoshihisa HIRANO. The version in the OST is slightly different than the Midi but the melody remains the same. I sequenced it directly by listening to the music in the anime.