Kento Igarashi

The company in which Fukihara worked developed the CHRONOS JAUNTER, a device that would enable one to time travel. The story follows Kazuhiro Fukihara in his quest to go back in time to save his girlfriend that died in a sudden accident. What was unknown to Fukihara was that the device had serious flaws that prevented time travel to function properly.

Tetsuo Togami is in the 2nd grade of high school. Due to a fight, he is hospitalized. There, he meets Maiko Takashiro. She has an incurable disease. She also has a hearing disability and is unable to talk. At first, Tetsuo becomes embarrassed but begins exchanging text messages with Maiko. Through the text messages, he begins having feelings for her. Even after his discharge from the hospital, he goes to visit Maiko every day. They promise to go out together on Maiko's birthday, but her condition worsens.

Shiho works as a neurosurgeon at Nishitokyo General Hospital. She decides to quit her profession after hallucinating during surgery. Her ex-teacher Masayuki Kitabatake is the director at Tokyo University Hospital and he persuades Shiho to work at his hospital in the diagnosis department which consists of all female doctors. Shiho, who is more stubborn in her will to save other patients, sometimes come in conflicts with the other doctors there, but she cooperates with them to reveal a mysterious malady.