The story is about two classmates named Sahoko and Rio who form a bond. Unfortunately, Rio is struggling with depression and self-harm and does not receive love and support from her family, which includes her father, stepmother, and stepbrother. However, Sahoko appears to be a ray of hope in Rio's life. Sahoko's past is shrouded in mystery, and her relationship with her parents appears to be strained. She resides with her aunt.