Tomota Dobara, a 35-year-old office worker with a fervent interest in light novels, reconnects with his old high school classmate, Mio Hayama, after an astounding 17-year absence. Sadly, Mio reveals that her son passed away in a car accident. However, to Dobara's surprise, she implores him to assist her in reconnecting with her son, whom she believes has been brought back to life in a parallel universe.