Question: The lead vocalist fort he band L'Arc-en-Ciel stars with Leehom Wang in a 2003 film screened on May 13 at what festival?

Context paragraphs:
Unbelievable (Wang Leehom album): Unbelievable () is the 9th album of the Taiwanese R&B artist and composer, Leehom Wang, and was released on October 15, 2003.

Gekitotsu Toma L'Arc: TomaRunner vs L'Arc-en-Ciel: Gekitotsu Toma L'Arc: TomaRunner vs L'Arc-en-Ciel (激突トマラルク ) is a Japan-exclusive racing game for the PlayStation.  It is the sequel to "TomaRunner" and includes members of the Japanese band L'Arc-en-Ciel as playable characters.

Tetsuya (musician): Tetsuya (テツヤ , born 3 October 1969) is a Japanese musician, best known as the leader and bassist of the rock band L'Arc-en-Ciel.  Formerly known by the stage name tetsu, on December 1, 2009 he started to use his birth name.  While in L'Arc-en-Ciel his name is stylized as tetsuya, whereas in his solo work it is stylized as TETSUYA.

Wang Leehom: Wang Leehom (born May 17, 1976), sometimes credited as Leehom Wang, is a Chinese-American singer-songwriter, record producer, actor and film director.  He is currently based in Taiwan.  Formally trained at the Eastman School of Music, Williams College and Berklee College of Music, his musical style is known for fusing Chinese elements (such as Beijing opera, traditional styles of ethnic minorities, Chinese classical orchestra) with hip-hop and R&B.  Wang debuted in 1995 and since then has released over 25 albums, with sales of over 50 million copies.  He is also a four-time winner and 19-time nominee of Taiwan's Golden Melody Awards, the "Grammys" of Chinese music.  His sold-out concert at the 90,000 seat Beijing Bird's Nest on April 14, 2012 was the first solo pop concert to be held at the iconic venue.  He holds honorary doctoral degrees from both Williams College and Berklee.  With over 60 million followers on social media, he is one of the most followed celebrities in China (peaked as #1 most followed person in China's social media in 2014).

Moon Child (2003 film): Moon Child is a 2003 Japanese action and drama film starring Gackt, Hyde, and Leehom Wang.  It was released on April 19 in Japan, and screened on May 13 at the Cannes Film Festival and on April 12, 2004 at Philadelphia Film Festival.

Hyde (musician): Hideto Takarai (寶井 秀人 , Takarai Hideto , born January 29, 1969 in Wakayama, Japan) , known exclusively by his stage name Hyde, is a Japanese musician, singer, songwriter, producer, and actor.  He is best known as the lead vocalist for the rock band L'Arc-en-Ciel, as well as for Vamps.  As a member of L'Arc-en-Ciel, his stage name is stylized as hyde, while as a solo artist and a member of Vamps it is stylized as HYDE.

Home (B'z song): "Home" is the twenty-fifth single by B'z, released on July 8, 1998.  This song is one of B'z many number-one singles in Oricon weekly chart.  Japanese rock band L'Arc-en-Ciel released three singles in the same day.  Although L'Arc-en-Ciel's three singles—"Honey", "Shinshoku (Lose Control)" and "Kasō"—passed the first week sales of 500,000 copies each and were ranked at number two, three and four respectively, the single "Home" managed to debut at the number-one position.  The single sold over 961,000 copies according to Oricon.  While they won "the artist of the year award", the song was elected as one of "songs of the year" at the 13th Japan Gold Disc Award.

Acid Android: Acid Android (often stylized as acid android) is the solo project of Yukihiro, drummer of the Japanese rock band L'Arc-en-Ciel.  They are signed to yukihiro's Tracks on Drugs label, a division of Ki/oon Records.  Acid Android releases, as with the other L'Arc-en-Ciel members' solo projects, take place when they are on hiatus.  To date Acid Android has released three albums, one mini album and EP, two singles, and three live DVDs.  The band, in contrast to L'Arc-en-Ciel, uses a harder, faster sound, more stage-lighting and American and European-styled mechanics to further energize their concerts.

Yukihiro (musician): Yukihiro, stylized as yukihiro and previously stylized as YUKIHIRO, (born November 24, 1968 in Ichikawa, Chiba) is a Japanese musician, best known as drummer of the rock band L'Arc-en-Ciel.  He also sings and plays bass for his solo project, Acid Android.  Before joining L'Arc-en-Ciel he was in the popular visual kei bands and Die in Cries.

Ken (musician): Ken (born November 28, 1968 in Maibara, Shiga, Japan) is a musician and singer-songwriter, best known as guitarist of the Japanese rock band L'Arc-en-Ciel.  He is also the leader, vocalist and guitarist of Sons of All Pussys (also known as S.O.A.P.) and has released a solo album entitled "In Physical".  While in L'Arc-en-Ciel his name is stylized as ken.

Supporting paragraphs: Moon Child (2003 film) Hyde (musician)
Answer: Cannes Film Festival