Ryuzaki Sumire is a fictional character from the popular Japanese visual novel and anime series Kagetsu Tohya. She is known for her strong personality and determination, often taking on challenges with confidence. Sumire is a skilled martial artist, which adds to her dynamic character traits. In the story, Sumire plays a significant role as a friend and ally to the main protagonist. Her interactions with other characters help to develop the plot and showcase her loyalty and bravery. Overall, she is a memorable character who contributes to the themes of friendship and perseverance in the series.