Saya Maekawa struggled to raise her beloved son, Sota, in a difficult life. However, Sota was affected by a disease. Saya had to keep taking her medication because her body was needed for a living transplant operation to save Sota from the strange malady "the neon illness". One night before the important operation, Saya got in a car accident and her life was endangered. Later, she woke up in a strange lab where a boy named Toma Morina was sitting by her side. Saya realized that she had become someone else: Aki Daito. She is finding out the way to save her son while overwhelmed by the strange events happening to her one after the other.
