The story begins as Aya prepares for the new semester. Despite being happy, she suffers from slight physical problems, which only her mother seems to notice. However, one day, she falls unconsciously on the floor. After she is sent to the hospital, she is shortly diagnosed with the disease. Despite the fact that she is diagnosed with the terminal illness, she does not lose the will to survive.She still makes friends with others, including her first love, Yuji. She later develops an interest in Haruto. Although somewhat cold, Haruto was still kind to her. Meanwhile, her health continues to deteriorate. Knowing that she will not survive for long, she returns the gift Haruto has given, who discovers the fact when he reads the love letter that Aya gave him.Aya Kitō proved her courage and positive attitude towards an uncertain future when suffering such an illness, spinocerebellar atrophy. The drama spans a decade, during which she graduates from school while her conditions worsen.This drama examines the complex range of feelings that patient, family, friends, and the general community, undergo during the painful process when someone so young is diagnosed with a terminal disease. In doing so, the script considers particularly the domestic situation of caring for an ill relative who requires specialized attention, but it also critiques general attitudes towards the disabled in Japanese society. Every new day for Aya means accepting new obstacles and new losses. Therefore, most importantly, this series commemorates the indomitable spirit who wrote a "record of a girl who was chosen by this strange disease."