Due to several reasons the four trainees will be alone during the night without a senior. A drunken man arrives that needs to have a complicated operation, that Aizawa and Hiyama perform with the help of the other two until a senior finally arrives. At the end of the episode, Shiaishi is allowed on the Heli, replacing Aizawa, who is not sohappy about this turn of events.

Aizawa had to amputate Kuroda's arm at the scene and they were re-attaching it again, but with not much hope that he'll be able to use it again. At the same time, Kuroda's son has an accident and was brought to the hospital the heli wehere he had to undergo an operation. While doing so, they saw that the boy has a brain tumor. Shiraishi is struggling with the guilt she feels while Aizawa is worrying if amputation was the right decision.

Shiaishi hands in her resignation, but the boss doesn't accept it. When she goes to Kuroda to excuse, a patient's constitution gets worse and she has to perform an emergency operation with Kuroda supervising her. Hiyama, Aizawa and Mitsui get a pregnant woman and although it's dangerous decide to rescue the mother and the child. The ep ends with Hiyama, Aizawa and Shiaishi arriving at a scene of a mass accident with lots of injured.

In the final episode of the season, the four trainees have to fight to keep the victims of the accident. They manage to save several lives, but also loose some. Fujikawa is allowed to use the heli for the first time. They all show that they are able to give their best in complicated situations and were acknowledged by their seniors.