Living in the Pale City, Zet was a young boy who one day discovered there was a young girl hidden beneath the costume of a monster who was kept locked in a tower. He befriended the girl, named Kroma. He even drugged her guard to set her free. Chatting on top of the highest tower in the city, he was harpooned from behind for his betrayal.

His ghost stood by Kroma's side as her conscience.