4 Hot Wave is singer-songwriter Koda Kumi's thirty-second single and is her first quadruple A-side, with each song containing a corresponding music video.

Despite losing the number-one spot to KinKi Kids' "Natu Moyou", 4 Hot Wave outsold them by over 80,000 copies.

Due to the single's success, it reclaimed the title of highest debut sales female artists, from Ayumi Hamasaki's "Blue Bird", which had originally taken the title from Koda Kumi's previous single, "Koi no Tsubomi".

[6] "Juicy" was featured as a television advertisement for jewelry company GemCerey's Binary Face necklace, which was designed by Koda Kumi.

[7] "With Your Smile" was the image song for NTV's Pride & Spirit 2006 Nippon Professional Baseball and featured in a Dwango commercial.

"Juicy" is the first video in the story, showing Kumi with her crew seducing a group of men in a bar, who have a treasure map.

While "Ningyo-hime" was shown to be a doll in the music video, she would perform it as a mermaid princess in her tour for the corresponding album, Black Cherry.