"Sad Tango" marks Rain's (or ピ in Japanese) debut single throughout Japan.

The single experiments with Latin style melodies tied with modern RNB beats.

The single was released on January 25, 2006 and entered the official Japanese Music Charts (Oricon) at number fourteen.

In the music video for Sad Tango, we follow the mysterious, dark figure of Rain entering a parking lot on his motorcycle after a white car.

The video alternates between Rain on the dance floor and him following the mysterious girl through the club.