DEEN is a Japanese pop-rock band formed in 1993. The project took shape after Shuuichi Ikemori was selected to sing for a DoCoMo commercial and later teamed up with keyboardist Koji Yamane. Their debut single, "Kono Mama Kimi Dake wo Ubaisaritai," became an immediate breakthrough, reaching No. 2 on the Oricon weekly chart, while the follow-up, "Tsubasa wo Hirogete," climbed to No. 1.
As the group developed, DEEN began writing and composing more of its own material, moving toward a more self-produced sound. In 1995, the band released "Mirai no Tame ni," its first self-composed single, which also reached No. 1. Around the same period, DEEN expanded its profile through songs connected to Dragon Ball GT and Meitantei Conan, and in 1996 it also took part in "Giniro no Yume ~All over the world~" for the Olympics.
In 1998, DEEN released the best album SINGLES+1 and changed labels from B-Gram Records to BMG Japan. During the 2000s, the band continued to broaden its catalog with ballad and cover albums, including Ballads in Blue ~The greatest hits of DEEN~ and Waon ~Songs for Children~, while also recording a theme song for Tokyo Verdy 1969 in 2004. Later releases such as "Diamond" for Tales of Destiny, performances tied to the Tales series, and the 15th-anniversary compilation DEEN PERFECT SINGLES + confirmed the group's long-running presence in Japanese anime and game music.
