Sakura Konotori is a gynecologist and also a pianist known as "Baby." He is the leader of a ob-gyn team and respected by his peers. One day, he begins to play the piano at a club in Tokyo. 10 minutes later, he stops playing and takes a call from the hospital on whether to accept a pregnant woman. He rushes to the hospital. The pregnant woman has never had an examination and the hospital isn't even sure how many months she has been pregnant. Sakura decides to accept the pregnant woman even though there is high risk. He asks the Neonatology team for help. Takayuki Imahashi is the leader of the Neonatology team and he prepares for the woman to give birth.