[Owaranai Destiny]

Just read up a few more things, and I came across a little information about the anime.

Spoiler:

As most animes at episode 12 or 13 have a little 'way-point', it might be indicated as such by the appearance of a second ending song sung by Yoko Ishida, called Aka no Seijaku. She was also the singer who did White Destiny, the opening song for the Pretear anime.