I've become obsessed with this song and how fitting it is for these two characters of mine Plus I've been in an Oekaki mood~
Wave (the dragon on the left) was caught by soldiers controlled by a tyrant known as the 'Scarlet King'. Marie (the dragon the right) was his love and when she finally encounters him again, she finds he's been corrupted by the said king's power and now fights on the side of evil as one of his elite fighters.