深海シティアンダーグラウンド (Shinkai City Underground)

Background
This song was first uploaded on PIAPRO on March 31, 2011, and was uploaded on niconico in November 2011. TanakaB rearranged the and also added a PV to the song. This is TanakaB's biggest hit, on November 25 to November 28 the song managed to maintain the position number one on the VOCALOID daily ranking page.

The song has no definite meaning, the lyrics clashes and jumps from one topic to another such as talking about a four leaf clover, rafflesia, or even a paranoid princess. It centers how Rin was in a place called "Shinkai City Underground".

This song is featured in the game -Project DIVA- Arcade.

This song is featured in the compilation album Vocalogemini.

This song entered the Hall of Fame on December 1, 2011 (after one week), but is now in the Hall of Legend.