Twenty years prior to the events of the story, Gall lost his wife and daughter to the disease despir. Stricken by grief and anger, he refused to allow any more victims, so he took up arms and became a wandering Somatic. He first meets Kor Meteor, Hisui Hearts, and Kohaku Hearts in the Twilight Forest, where Kohaku has been stricken by an intense case of despir, leaving her a hollow shell of her former self. Kor and Hisui degenerate into an argument over how to handle Kohaku's inability to cross a bridge, and he is disgusted over the fact that they're neglecting Kohaku. Gall forces Kohaku to cross, breaking the stalemate. He then decides to join Kor and Hisui on their journey, lending his expertise in what is the worst case of despir he's ever seen and unable to trust Kor and Hisui to do the job properly. He then saves the group from a monster that seems to defy the laws of the world, bringing it in line with the one they are in.