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 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 went singing as a soloist under her name; Ryo Owatari was dedicating his time to the 3-piece band Missile Innovation and supporting other bands/artists on guitars; and Dai Nagao continued acting as a composer for various Avex Trax artists.

After 3 years of inactivity, the band comes back with a new site layout, new supporting members and a promise of new releases. They officially return on 29 of september, the same day they started their career on 1999 and the same day they broke up on 2005.
They surprised everyone when they played in a-nation'08 without any previous announcement, and there's a concert scheduled for 30 of september.