Biyuuden, Viyuden, Biyuden

Also named Biyuuden, Viyuden, Biyuden
Chinese name: 美勇伝

v-u-den was formed in August of 2004 and consisted of Ishikawa Rika (former member of Morning Musume), Miyoshi Erika (winner of a 2003 Hello! Project auditon), and Okada Yui (a former Hello! Pro Egg who made her debut). The group's formation was announced alongside Ishikawa's graduation from Morning Musume, and her official reason for graduating was to lead v-u-den full-time.

History of v-u-den(美勇伝)
Aichi Kyouhaku Partnership Jigyou Event – Hello Project 2005 All Stars Dairanbu ~A Happy New Power Iida Kaori Sotsugou Special~ – January 29, 2005 - January 30, 2005
Aichi Kyouhaku Partnership Jigyou Event – v-u-den FIRST CONCERT TOUR 2005 Haru ~v-u-den Densetsu~ – May 28, 2005 - May 29, 2005
Aichi Kyouhaku Partnership Jigyou Event – Hello Project 2005 Natsu no Kayou Show -'05 Selection! Collection- – July 10, 16, 23, 24, 2005

美勇伝 is found romanized in several ways on the Internet, including "v-u-den", "Biyuuden", and "vi-yu-den", among others. There is evidence that references each of the above spellings of the name, including their costumes in the H.P. All Stars video, their singles, their photobooks and magazine articles. Which one is correct depends on the romanization system you use or on how Tsunku is feeling on any particular day.

The differences in romanization are largely due to a misunderstanding of the sound being pronounced. The Japanese language doesn't really have a "V" sound. So while the group's name may be spelled with a V, it will be pronounced as a "B" sound by native Japanese speakers, and this is where the romanization gets confusing.