"4 Hot Wave" (stylized as 4 hot wave) is Japanese singer Koda Kumi's 32nd single on the Rhythm Zone label. It charted at No. 2 on Oricon and stayed on the charts for seventeen weeks. The sales for the single became her highest selling single, even surpassing the total sales of real Emotion/1000 no Kotoba in less than three weeks. It became her highest debut single and reclaimed the title of Highest Debut Sales Female Artists, previously held by Ayumi Hamasaki's Blue Bird. Information 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. It hit No. 2 on the Oricon Singles Charts and remained on the charts for seventeen consecutive weeks. The sales for 4 hot wave made it her highest selling single, even surpassing the total sales of real Emotion/1000 no Kotoba in less than three weeks. Within its first week, the single sold 207,484 copies, with 489,000 in total. Despite losing the number-one spot to KinKi Kids' Natu Moyou, 4 hot wave outsold them by over 80,000 copies. At the end of the year, the single ranked No. 2 on Highest Selling Single Female Artist, losing out to Naoru Amane's Taiyou no Uta, which was used in her film Midnight Sun. 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. The single was Kumi's first quadruple a-side, with each song's music video tying together into one story. The single's artwork was shot in Morocco while Kumi was in the country shooting for her new photo-book Maroc. The videos for "With your smile" and "I'll be there" were shot in Australia, with "I'll be there" shot on Fraser Island. "Ningyo-hime" was certified gold for full-length cellphone downloads. Television advertisements Each song from the single was used for a promotional campaign during the single's release. "I'll be there" was featured in a television advertisement for Sea Breeze, a sun-tan lotion company. "Juicy" was featured as a television advertisement for jewelry company GemCerey's Binary Face necklace, which was designed by Koda Kumi. "With Your Smile" was the image song for NTV's Pride & Spirit 2006 Nippon Professional Baseball and featured in a Dwango commercial. "Ningyo-hime" (人魚姫 / Mermaid Princess) was featured in