Izumi Matsumoto is a supporting character in the anime series Shirobako. She was one of the five main friends from the animation club during high school, alongside Aoi Miyamori and others. As an adult, Izumi is a professional scriptwriter who works on anime projects. Her journey reflects the challenges and aspirations of creative professionals in the industry, and she serves as an inspiration to her friends, showing the importance of perseverance, passion, and teamwork in pursuing a career in animation.