My apologies for double-posting, but I thought I'd post this little piece of news: EXTRACT's title track credits are revealed!
Title: EXTRACT ～The truth in me～
Vocal, Lyrics: Mami Kawada
Composition/Arrangement: Kazuya Takase
So, it will be sung by Mami! That's great.
(Thanks for the info to I've Sound Blog, as always.)