The group is also a member of the Sapporo-based music production group I've Sound.
The Sound of Music | sound recording and reproduction | Puget Sound | Long Island Sound | sound film | sound | McMurdo Sound | Ministry of Sound | The Sound of Music (film) | King George Sound | Sound recording and reproduction | Owen Sound | Sound film | sound design | Sound | National Film and Sound Archive | Prince William Sound | Academy Award for Best Sound | sound barrier | The Sound and the Fury | Sneaky Sound System | The Sound | Muscle Shoals Sound Studio | University of Puget Sound | The Sound of Silence | Speed of sound | Sound of Fire | sound effect | Primavera Sound | Plymouth Sound |
She later became a guest vocalist for I've Sound and appeared at the Nippon Budokan on October 15, 2005 at the I've concert "I've in Budokan 2005: Open the Birth Gate", where she sang two songs: a remix version of "Verge" and the normal version of "Last regrets".