You Drew a Songstress, Didn't You?

When disaster strikes, foreign enemies invade, and the world teeters on the brink of destruction, saviors descend upon the world with incredible powers. They bestow wondrous abilities upon us, and from then on, those they choose shoulder the responsibility of protecting the world. They are honored with the title of Chosen Ones.

After my girlfriend goes missing, I too become one of the Chosen Ones, driven by a desire for revenge. But why is the role I have been granted... a songstress?