Sleeper (Tie) is Captain Mirai's third original Vocaloid work using Rin; first uploaded on May 7, 2008. It currently has only 30,000 views to date (very slow considering the fact that it's uploaded on 2008) however a fanmade PV drawn by Glider exceeds the views Captain Mirai has on the original upload.
The song is the third track of seven to Captain Mirai's "Illusion Theory Series"; being one of it's most notable far. Sleeper (Tie) is a piece of timber, stone, or steel on near ground to support a superstructure, keep railroad rails in place.
It tells a story of Rin on a quiet journey to the future, (with a train). With confidence inside, she walked to the future.