Guzuko was the LRIG of Sou Sumida in Lostorage incited WIXOSS. She now serves as one of the main antagonists in Lostorage conflated WIXOSS. She has a timid personality and the habit of often saying apologetic words such as "I'm sorry" or "Excuse me", due to Sumida's constant verbal abuse. However, despite her timid personality, she will occasionally try to scold Sou, when he's doing something that she thinks is wrong.