Gates of Heaven is an album by Do As Infinity. It was released in 2003. "Azayaka na Hana" is one of the first songs Ryo Owatari wrote before auditioning for Do as Infinity, it was written for his former band, Peek-A-Boo! He also recorded a new version of the song with his new band Missile Innovation in their self-titled mini-album. The Asia version of the album included a Mandarin version of Shinjitsu no Uta as a bonus track.