Setsuna Kiyoura is a main supporting character in the anime series 'School Days.' She is the best friend of Kotonoha Katsura and plays a pivotal role in the story, often acting as a protector and confidante. Setsuna is known for her calm, serious demeanor and her loyalty toward her friends. Throughout the series, she attempts to support and guide those around her, sometimes making difficult decisions that affect the relationships and events within the story.