The main character. He is a warm-hearted, caring Ayakashi handler fighting for the sake of a promise he made to Hime and Izumi two years before the main story. His promise was to protect them. Yu has the strongest Ayakashi, Ryuu. Ryuu is a dragon-like Ayakashi. He was in love with Izumi but changed after her death. He cares deeply for Hime and Eimu.