The album is available to preorder on iTunes if you want to hear Kousaten and a clearer version of Tomo yo.
https://itun.es/us/Zbf--For me, the preview order is messed up. The only one that was correct was "Tomo yo." But if any of you have the same problem, Track #1 (Taiki Bansei) is a preview of "Kousaten".
Kousaten (a ballad) reminds me of Watashi no Kokoro. It definitely sounds like a "good bye" song.
Edit: Tomo yo (Radio Rip)