Ai no Kankyou Kenkyuu Center / Manatsu no Sora no Iro

 is the sixth single released by Takoku Sekigun.

CD

 * 1) Ai no Kankyou Kenkyuu Center (愛の環境研究センター)
 * 2) Manatsu no Sora no Iro (真夏の空の色)
 * 3) Ai no Kankyou Kenkyuu Center (愛の環境研究センター) (OFF VOCAL)
 * 4) Manatsu no Sora no Iro (真夏の空の色) (OFF VOCAL)

Limited Edition DVD

 * Unknown

Featured Members

 * Takiguchi Narumi
 * Osaki Kira
 * Marichu