Yuenü (故縫う Romanized as Yuenū; Lit. "Sewing Reason") is a former resident of Skypeia who had fallen down after an unnamed scenario. Due to this, she was labelled an outcast by those on the "Earth", and was eventually taken in by Monster Party's Kateryna based on what she had learned from her captain. Since then, despite her young age, she serves as the fully functional swordswoman of the crew.