On both Dragon Ash’s "Grateful Days" and DJ Krush’s "Tragicomic", ACO plays the same role — deliver the chorus. Once in a while, she’ll contribute a flourish behind the rappers, but for the most part, she stays out of the way till the focus needs to be on her.
And that was a wise decision on both Krush’s and Dragon Ash’s parts.
ACO’s soulful voice would have drawn too much attention away from the rhymes, making them a distraction. Her presence becomes all that more powerful when she does emerge from the background.
On "Tragicomic", Twigy is the interchangeable part — anyone could fill the role of the rapper. But Krush’s dark backdrop and ACO’s eerie interjections — she looks possessed in the video — are immovable. This song was released as a single in Japan and appears on the compilation Japan for Sale.