Consisting of Tomiko Van (vocalist), Ryo Owatari (guitarist), and Dai Nagao (composer), Do As Infinity (D.A.I.) was one of the most popular names in Japanese pop music. Several of their songs were used as themes for Japanese television shows, movies, video games, and anime, which gained them a great amount of popularity both in Japan and worldwide.

The group disbanded in September 2005 and performed their last live concert at the Nippon Budokan. Each member moved onto other projects. Tomiko Van is currently singing as a soloist under her name. Ryo Owatari is now fully dedicating his time to the 3-piece band Missile Innovation and Dai Nagao continues to act as a composer for various Avex Trax artists.