One day, Kana, a pregnant woman scheduled to give birth at Dojo Hospital, is brought in urgently complaining of abdominal pain. According to obstetrician and gynecologist Keiichi Kobayakawa (Yasufumi Hayashi), she has a retroperitoneal tumor that needs to be surgically removed as soon as possible. She is currently 17 weeks pregnant. The fetus must be removed by C-section at 22 weeks, but if the tumor is left untreated until then, both mother and fetus will be in a dangerous situation.