The song was uploaded on May 30, 2008. It is Yugami-P's second song. It has more than 300,000 views on Nico Nico Douga and has become one of the Kagamines' most well known songs.
In the song, Len and Rin's "corpses" are going to be "exchanged". They are also in a black and white hospital ward (hence the title "Monochrome Ward"), one brief flash back shows that Rin used to visit Len in the ward. Len seemingly tries to escape the hospital, asking Rin for directions to the exit. Someone, possibly Rin, going around the hospital killing people and Meiko tells Len to be wary.
After the exchange, Rin tells Len that even though they have switched bodies, he will always be a nobody.