Proof of life

Background
"proof of life" is the answer song to Hitoshizuku-P's hit song "soundless voice", first uploaded on November 29th. soundless voice was quite popular with over half a million views, and a month after it was uploaded, Hitoshizuku-P uploaded an "answer song" to tell Rin's version to the story.

It tells a story of Rin, who was apparently dying. She tried to convince herself that everything would be alright and kept on singing. Even with Len comforting her she still couldn't deny the fact that her time would be up. In the end she died, her last words being "thank you".

In Hitoshizuku-P's album STORIA, a remastered track of proof of life, and also the third song to the mini series "endless wedge" is available, explaining more to what happened after Rin died.

Japanese and Romaji Lyrics
ありがとう…

"Arigatou..."