Kieru (きえる, Disappear) was used as the theme song for the film version of the novel Snakes and Earrings (蛇にピアス, Hebi ni Piasu).

The lyrics of both songs were written in collaboration with Snakes and Earrings author Hitomi Kanehara, with Kanehara primarily writing Kieru and Chara primarily writing Kiss.

Time After Time, a duet with Super Butter Dogs vocalist Hanaregumi, had already been released on the 2008 compilation album We Love Cyndi – Tribute to Cyndi Lauper released two months prior.

A music video for the title track Kiss was created, and shot by Fumiko Hirano.

The pair watch an offshore tornado arrive, and are covered in written paper notes.