Helena is your average teenager. Well, if having lung cancer counts as average. She knows that she's bound to die eventually, but she keeps living her life the best she can. Everything changes, however, when one day, she laughs so hard... That she sees the Black Parade. She's desperate for answers, and so she looks to Gerard, who is the leader of the Black Parade. Helena knows that falling in love with him might be wrong, but she still does. Will Helena keep on living, or will she be forced to say... 'So long and goodnight'?