"[4][5] The b-side to the single was an alternate version of "Rain," the original which had previously been released on her third studio album, Feel My Mind.

[7][8] To help promote the single, "No Regret" was used as the opening theme to the second season of the Japanese anime series, The Law of Ueki, which was an adaptation of the manga of the same name.

The music video did take on a Charlie's Angels theme with a trio of crime fighters who go undercover at a nightclub.

In the video, several homages are paid to the Wachowski brothers' 1999 science fiction film The Matrix, with Kumi performing some of the shots with bullet time visual effects.

For the collection, each single was given its own unique cover art, each which represented a dress from a different culture.

Along with differing cover art, each obi strip contained a piece of an image, which when put together in order, would reveal a full picture of Kumi.