Miyama Yoko works as a doctor at Touto Hospital. She specializes in brain aneurysms in the neurosurgery department. She is a good doctor, aware of her responsibilities and importance of her work. She places the patients' life at the top of her priorities. Yoko Miyama becomes involved with her colleagues, including Kuroiwa Kengo, Kozukue Sachiko, and Nishigoori Takuma. Meanwhile, she suffers from guilt for abandoning her family.