TO JOIN FORCES featuring Kitadani Hiroshi / Soba ni Irukara featuring Yoshida Hitomi

 is the fourth single by Ikeda Aya, featuring Kitadani Hiroshi and Yoshida Hitomi.

Tracklist

 * 1) TO JOIN FORCES featuring Kitadani Hiroshi
 * 2) Soba ni Irukara (そばにいるから) featuring Yoshida Hitomi