User blog comment:Kopakamata97/Vote on The Silence of the End's Theme Song/@comment-439429-20130512163800

Not sure about main theme, but as a soundtrack, this could fit well as a soundtrack. https://www.youtube.com/watch?v=0YILeo5xWsU

Fun (maybe unimportant) fact: It was one of the tracks that I considered to use for The Sitrius Duty (the film project).