Perfume

Perfume is a Japanese techno-pop girl group consisting of three members, (KASHIYUKA),  (a~chan), and  (NOCCHi). The group has been active since early 2000 and is known within JoJo's Bizarre Adventure for one of their songs being the namesake of Chocolate Disco, the first Stand in the series to be named after a Japanese language song.

History
The group was formed in 2000 by Ayaka Nishiwaki, Yuka Kashino, and former member Yuka Kawashima (河島 佑香) in the young talent academy in. Because the three of them had the kanji for "fragrance" (香) in their names, they decided to name the group "Perfume" (香水).

KASHIYUKA
Yuka Kashino (樫野 有香) is known by her stage name KASHIYUKA.

KASHIYUKA is infamous for being a big fan of JoJo's Bizarre Adventure. Her favorite part is currently Vento Aureo, and her favorite character is Giorno Giovanna. She also likes Bruno Bucciarati and Jotaro Kujo. When Perfume appeared on the TV show Music Fighter in April 2009, KASHIYUKA revealed that JoJo's Bizarre Adventure was the thing that she was most into right now. Initially, she disliked the series because of its "crude" art style but began reading it after a JoJo fan passionately recommended it to her. KASHIYUKA also revealed that JoJo was the manga series that she was recently addicted to in an interview with Perfume in the music magazine What's In from March 2009.

While on stage during the Perfume Second Tour in October 2009, KASHIYUKA talked about the appearance of Chocolate Disco in Steel Ball Run, saying that she was happy to hear that one of her songs made it into her favorite manga.

Perfume made a guest appearance on the show Happy Music hosted by TV personality,, on April 16, 2010. During the show, Becky asked KASHIYUKA to show something that made her happy, to which she then held volumes of Steel Ball Run to the camera to discuss JoJo. She also presented photos revealing various figures in her room, including a copy of JOJO A-GO!GO!. KASHIYUKA also showed her bookshelf containing over a hundred volumes of JoJo lined up side by side. At the end of the show, Becky and the members of Perfume re-enacted the cover of SBR Volume 14.

On March 1, 2010, KASHIYUKA was invited to Araki's house for an interview, though the details are lost due to it only being posted on a "members-only" blog, which has since been deleted. The blog also featured a JoJo style picture of the members of Perfume. In 2012, Kashino was also invited by Araki to the JoJo's Bizarre Adventure's 25th Anniversary commemorative party in Tokyo.

KASHIYUKA has incorporated JoJo poses into the group's choreography, notably in the cover art of the "Fushizen na Girl" (不自然なガール)/"Natural ni Koishite" (ナチュラルに恋して) double A-side single and in the "Natural ni Koishite" music video.

a~chan
Ayaka Nishiwaki (西脇 綾香) is known by her stage name a~chan.

In an author's comment from Ultra Jump in March 2010, Araki describes coincidentally meeting a~chan while out shopping.

Ayano Omoto
Ayano Omoto (大本 彩乃) is known by her stage name NOCCHi. She joined Perfume in 2001 after it was founded, replacing original member Yuka Kawashima. Prior to joining Perfume, she was a member of earlier idol groups Happy Baby (ハッピーベイビー) and La Ayanota (ラ・アヤノータ).

While on stage in October 2009, KASHIYUKA mentioned that NOCCHi's hair was similar to Bruno Bucciarati from Vento Aureo.

"Chocolate Disco"
"Chocolate Disco" (チョコレイト・ディスコ) was included as one of the two tracks featured on "Fan Service [sweet]", Perfume's ninth single. It was released on February 14, 2007. The song "Chocolate Disco" was later included as the fifth track on Perfume's debut studio album, released April 16, 2008. Following its release, GAME has been cited as one of the most successful techno-pop albums of all time, with many of the tracks being compared to French duo.

The song "Chocolate Disco" was used as the namesake for the Stand Chocolate Disco in Steel Ball Run, making it the first Stand in the series to be named after a song from a Japanese artist. People at the time speculated that the first Japanese Stand name would either be a song from Shoko Nakagawa or SOUL'd OUT, since both had close ties to Araki and were notable fans of the series. The inclusion of "Chocolate Disco" was very unexpected, as Araki is rarely known to listen to Japanese music.

Music producer, who wrote and composed "Chocolate Disco" for Perfume, said in an interview that his favorite manga was JoJo's Bizarre Adventure and that he was impressed to find out about the appearance of Chocolate Disco in the series. Nakata was very happy to have his song featured as a Stand and would advertise it as such whenever he played it at events.

The names of both D-I-S-C-O and the Stand Chocolate Disco were later changed in SBR Volume 17. The Stand's name was changed to Chokorēto Disuko (チョコレート・ディスコ), making it slightly different from the song's title in Japanese, while the user's name was changed from Disuko (ディスコ) to Di-Su-Ko (ディ・ス・コ).

Trivia

 * A popular fan comic depicting the members of Perfume with different Stands was created in June 2008. The comic showed with the Stand "Chocolate Disco." Interestingly, this was posted two months before Chocolate Disco's reveal in Steel Ball Run.