Wow, thank you for all the suggestions! They really help a lot. I really like "Our Solemn Hour" and "Wings of Despair". I think right now I'm considering those, and "Shadow to Light", an Amethystium song. Or, if there were some way to condense the following lyrics into a title:

bokura kitto kurayami no kaina kara umarete kita
kanawanu koi wo suru you ni
hikari e to izanawarete

we were surely born from the arms of darkness
as if bearing a love that can never be realized
we are drawn towards the light

(from Kouya Ruten (http://www.twin-elements.com/lyrics/jpop/fictionjunction-yuuka/kouya-ruten))