Mio Ichijo, who was long favored in Professor Sugihara's economics seminar at university, was able to rise to the position of associate professor under his guidance. At Sugihara's wife's funeral, she meets his son Yuji, they marry, and begin actively trying to conceive. However, after showing no signs of pregnancy, they test Yuji's sperm—revealing he has azoospermia. In that moment, Mio finds herself recalling her revered mentor, Professor Sugihara, who is now also her father-in-law. The relationship with Sugihara she once fantasized about countless times is now about to become reality.