Onda Kokoro is an oncologist called Dr Onkoro for short by the people around her and teased that she was born for this path. She got married to Takumi, whom she had known since she was a student, and they had a son. Life was going smoothly for her. But three months ago, her husband fell in an accident and remained unconsciousness even though he underwent emergency surgery. Although Kokoro puts on a brave face at work, she still has not been able to accept reality. One day, she meets Kajiyama Kaoru, a competent gastroenterologist who has transferred to work at the hospital. Kaoru understands the need for oncology as a surgeon and gives emotional support with her sunny personality as a colleague. She becomes a dear friend whom Kokoro feels is sudden a ray of light in her personal and professional life…