When you have a wife who, without knowing, made her own breathing style at the age of 5 because her parents failed to protect her from demons. And when you figure out about the breathing style's strength that could suppress Sun breathing...humans are impressed of it and demons are extremely fearing it. It became known all over, all demon slayers wanted to meet this girl who possessed this strong breathing style she made, but no one ever figured out who it was, what they looked like, or why they made the breathing style, because no one ever met the girl. But for many years the stories of the girl who possesses Wisteria breathing, is talked of, people want to recruit her.