Mauve-iro no Sympathy is a song sung 의해 Maka's and Soul's voice actor.
So basically, it's their character song. :3

If 당신 want to listen to the song, go link

~Original Lyrics~
(The one in Japanese xD)

Moobuiro no fukai yoru takaku uneru ano tsuki ga AH tataeru
Kudakechitta garekikuzu niou yatsu no tamashii ga SO yonderu

Yami ni ikiru futatsu no unmei
Watashi no te to ore no ude ga
Hibikiaeba ima SHAKE UP! SHAKE UP!

Makuro ni kasoku hachou no SOUL STYLE
Mamorinuku tame tsuyoku nareru
Heiwa to seigi ha DEATH OF (THE) RULE
Akai shibuki ha suukouna yaiba
Kizuna umareshi toki negai ha todoku FIGHT OUT! FIGHT...