Secret is the fourth studio album by Japanese singer-songwriter Koda Kumi, released on February 9, 2005.

[1] It sold over 600,000 copies in the country and was certified 2× Platinum by the Recording Industry Association of Japan (RIAJ).

The outfit was heavily criticized, when revealing clothing was not worn by mainstream artists in Japan at the time.

[2] On April 13, 2005, three special editions of the album were released, which contained the Music video for "Hot Stuff", which featured the rapper KM-Markit and, depending on which special edition was purchased, came with a T-shirt or a tank top.

"Selfish" carries a story of female vampires luring men to their hideout so they are able to live off their life force.

The video for "24" contains a soft and sensual concept, showing Kumi in her downtime as she fantasizes about a lover.

The Music video to "Hot Stuff" was later placed on the DVD when the special edition was released two months later.

The Music video carried a dance battle theme, which had been inspired by the North American film You Got Served, which featured Omarion Grandberry and Marques Houston.