On September 9th, the day of the Katakai Fireworks Festival, high school student Hana comes home from the hospital after six months of treatment for leukemia. She then discovers that her older brother Taro has become a hikikomori (social recluse). Taro used to be tender, smart and proud of his younger sister, but now he even turns his back on her and stays in his room. Her parents act like there is
