Saya Maekawa struggles to raise her son Sota, who is affected by a strange malady known as “the neon illness.” Saya must stay on medication to participate in a transplant surgery for her son. But one night before an important operation, Saya gets into a car accident, and her own life is put in danger. When she comes to, she’s in a laboratory that she doesn’t recognize. A boy named Toma Morina is sitting by her side. She soon discovers that she has become Aki Daito, a completely different person. Although confused by the strange events that keep happening, she continues to look for a way to save her beloved son, Sota.