"Recycle Bin" was first uploaded on February 12, 2008 and is Shibashon-P's first original Vocaloid work (although he had uploaded covers before). On October 10, eight months after the song was uploaded, it entered the Nico Hall of Fame (for songs exceeding 100,000 views). "Recycle Bin" currently has over 230,000 views.
The song tells a story about how Len was "deleted" from his master's computer. He sings about how it was dark and how he couldn't see or feel anything in the "recycle bin". Near the end of the song he wonders if he heard someone whispering words of regret (despite the fact he said he in the beginning that he couldn't hear anything).
Shibashon-P uploaded an "answer song" to Len's Recycle Bin entitled "Salvage", and the story continues about what happened to Len and Rin after the events of "Recycle Bin".