Simon and April are immortal lovers who are reincarnated as 36-year-old Simon and his 16-year-old niece April. Simon believes April is just an immature teenager and tries to avoid her, while April thinks they are meant to be together. The story follows their lives over many years, including Simon struggling with his feelings for April. It ends when April reaches 80 years old. The story explores their forbidden romance as they try to experience life as mortals in modern times.