Casshern Sins ED single - Reason by KANA

Last month I reviewed the Casshern Sins ED (here) and I was a little harsh on my ratings. But now that I've heard the full version of Reason by KANA many times, and also maybe because I love the Casshern Sins anime so much, my new rating is 7/10.
You can download the full ED single with booklet here.

Here's the Tracklist:

1. reason
2. Days ~ Sorezore no Kisetsu de
3. reason (inst)
4. Days ~ Sorezore no Kisetsu de (inst)