Mōnsuto serves as Gretel's adopted daughter and a dedicated member of the Brutal Blade faction. Her worldview is deliberately manipulated by those around her, who conceal the truth about their reality. This deception fuels her motivations and ignites a searing hatred toward Gaia. She emerges during pivotal story segments, specifically within manga chapters 129 and 149, and features in the animated adaptation's episodes three to five. Her actions directly influence Brutal Blade's conflicts with the Disasters, entities endangering the world's stability.