Rugrats Theory

Rugrats Theory is a song written and produced by Childhood Crusher-P. It was originally sung by Megurine Luka in English as a short song but it's full version was later sung by Kaai Yuki in Japanese. The song became popular on YouTube and was Childhood Crusher-P's first original song.

Original Version:
 * YouTube Broadcast

Full Version:
 * Youtube Broadcast

Background
The original version of the song sung by Megurine Luka in English was uploaded onto YouTube on September 3, 2011. The original version got popular on YouTube and, because of demand, a full version was later uploaded on October 31, 2011.

The song was based on a theory of the cartoon "Rugrats". The original theory can be read here. The song became popular and received many fanarts and Vocaloid and UTAU covers as well.