Kukui is a Japanese band consisting of Haruka Shimotsuki (vocal, lyrics & composition) and Myu (composition, arrangement & lyrics). They have produced songs for anime and games, most notably the Rozen Maiden anime series.

Originally, Shimotsuki and Myu of Refio (formerly a band made up of Myu and Riya) collaborated under the name Refio + Haruka Shimotsuki when they performed Toumei Shelter, ending theme for Rozen Maiden in 2004. Not long after they formed Kukui and produced a dojin single Yumewatari no Yoru, which was sold at the 67th Comic Market the same year. The following year they returned to provide the ending theme for Rozen Maiden's second season, Träumend, and made their first major release as Kukui with the mini album Hikari no Rasenritsu. Their first album, Leer Lied was released in 2007.

Discography:

-Singles

* Toumei Shelter (released on November 25, 2004 as refio + Haruka Shimotsuki) — TV anime Rozen Maiden ending theme

* Yumewatari no Yoru (independent release, released on 29 December 2004)
1. Yumewatari no Yoru
2. Ame no Ato ni
3. Yumewatari no Yoru (off vocal)
4. Ame no Ato ni (off vocal)

* Little Primrose (released on January 25, 2006)
1. Little Primrose — TV anime Kagihime Monogatari Eikyū Alice Rondo opening theme
2. Amayadori
3. Little Primrose (off vocal)
4. Amayadori (off vocal)

* Starry Waltz (released on April 26, 2006)
1. Starry Waltz — TV anime Nishi no Yoki Majo Astraea Testament opening theme
2. Yami no Rinne
3. Starry Waltz
4. Yami no Rinne

* Concordia (released on May 23, 2007)
1. Concordia — TV anime Shinkyoku Sōkai Polyphonica ending theme
2. Nijuusou
3. Concordia Instrumental
4. Nijuusou Instrumental

* Nijiiro Quartz (to be released on July 11, 2007)
1. Nijiiro Quartz — PlayStation 2 game Angel Profile opening theme
2. Sora no Melody — PlayStation 2 game Angel Profile ending theme

-Albums

* Hikari no Rasenritsu (mini album, released on November 23, 2005) — TV anime Rozen Maiden träumend ending theme
* Rozen Maiden Best Album: Leer Lied (released on April 25, 2007)

-Other

* "Kibou no Hane" — kukui presents (from Haruka Shimotsuki's Ashiato Rhythm album, released on September 22, 2005)