Saki Mizukoshi is one of the main characters in the anime series 'Natsuiro Kiseki'. She is a middle school student with a strong-willed and determined personality. Saki is often seen as the responsible and level-headed member of her group of friends. Despite her serious demeanor, she deeply cares for her friends and is always there to support them. In the series, Saki plays a significant role as she navigates the challenges of friendship and adolescence, all while dealing with the mysterious supernatural events that occur during their summer vacation.