Board Thread:Off-Topic Discussion/@comment-24164361-20141017132442/@comment-26239285-20151224015511

it's hard to say which is the most sad, but all the following come to mind:

there are more that are not sad songs in themselves but make me feel sad for personal reasons.
 * soundless voice
 * proof of life
 * magic mirror
 * servant of evil
 * onegai sekai (Please, World)
 * Ōkami Shōnen no Saigo no Uso (not so well known, but the twist at the end ...)
 * Last Elegy (also not well known, a song about someone dying)