After reading this manga it makes me think of two songs. Loved it, I'm so glad the sequels were there to complete the story.
Songs:
Nomyn & Veela - Say It
&
MONDO GROSSO - False Sympathy
I finished the anime the other day and just finished binging the entire currently available manga. I really recommend just starting from the beginning. There are characters that don't show up in the anime and some jokes/scenarios too.