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.

A gas pipe explodes in a factory causing over thirty casualties, one of which gets blown against a protruding iron bar. The senior doctors are busy, and the rescue can't help either. Dr. Mitsui's past is catching up with her, causing a stir in the hospital.

The four newbies will be doing "normal" work at the ICU, but they have the aim to right the Doctor Heli. However, only their supervisor decides who will ride on it and he'll base his decision on their skills. While Shiraishi fails to make the right decision on the actual scene, Aizawa can handle the situation. Meanwhile, Hiyama and Fujikawa have to realize that the "normal" work in the hospital is tough and emotionally challenging as well.

Aizawa's put in charge of a very important task; Fujikawa makes a mistake in the ER; no one seems to be able to identify Shiraishi's patient's odd illness; Dr. Kuroda is unsatisfied with Fujikawa's work, but is having a change of heart regarding Hiyama. Personal histories of the trainees start to unravel.

Aizawa makes a mistake when he chose a seemingly more interesting case and sent an old woman back home instead that later collapses and falls into coma, leaving Aizawa with feelings of guilt. Hiyama is allowed to get on the Heli, but at the actual scene she cannot do much. Since the seniors are busy, Aizawa comes to help her out. Meanwhile, Fujikawa has to deal with a man that is wearing bras and Shiaishi dealing with a woman with a broken nose that don't want it to be operated.

Aizawa's grandmother is hospitalized and suffers from demence causing her to not recognize her own grandson. Aizawa tried hard to not get emotionally involved to carry on his work properly, but in the end, he breaks down, crying while he takes care for her. Fujikawa gets a patient whose son had cast a curse on him. When all symptomps are alike the spell, he is on the verge of giving up, but Saejima, the nurse, finds out the cause.

Aizawa's grandmother refuses to eat, so Fujikawa tries his best, but can't bring her to eat. He asks Aizawa to come and spend some time with her, but he rather wants to operate and practise his skills. In the end, however, he visits her, although she still doesn't recognize him. Saejime gets visited by her ex-boyfriend, who is ill and sits in a wheelchair. She breaks up with him as he is a burden to her, though she feels really bad for being that egoistic.

A whole family keeps the four trainees busy. The mother and daughter are dominant, the grandfather doesn't care about rules (he leaves to take a look at the heli) and the father is calm. The lil girl is all over Aizawa, who grows fond of her too. The two male family members have to undergo an operation leaving their women worrying, but things go well. Shiaishi and Kuroda take the heli, but the scene is still dangerous and Kuroda saves Shiaishi from getting hit by a metal bar which lands on him.

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.