Seven students who have passed the extremely difficult selection test to become pararescue jumpers (commonly known as PJs/pararescue jumpers) belonging to the Aviation Rescue Group, an expert unit for saving lives, are lined up. Sawai Jin (Kamio Fuju), Fujiki Sayaka (Ishii Anna), Shirakawa Tomoki (Maeda Kentaro), Hasebe Tatsuya (Watanabe Aoto), Nishitani Randy (Keita Kusama Richard), Tokairin Yuuki (Inukai Takatake), and Kondo Mamoru (Maeda Oshiro) -- the members who passed through the narrow gate and will be training to become PJs at the Rescue Training Unit. As the seven students listen to the instruction of the training unit leader, Horikoshi Shoichi (Shishido Kai), with nervous expressions on their faces, they suddenly hear the sound of a helicopter approaching. The seven surprised students and instructors including Nishina Ren (Hamada Gaku) look up to the sky, where a rescue helicopter, a UH-60J, begins to hover.

As the harsh comprehensive sea training approaches, the training begins in the pool, where they patrol three air stations set up underwater while barely keeping themselves breathing. Then, Hasebe Tatsuya (Watanabe Aoto) loses consciousness as he becomes short of breath. Shirakawa Tomoki (Maeda Kentaro), who sees this, is overcome with tremendous fear... Shirakawa grew up in an orphanage and aimed to become a pararescue jumper in the hopes of becoming a hero to his fellow students at the facility. He was the top student when he passed the exam, and was relied on by the other trainees. Shirakawa pretends to be calm and behaves bravely, but he has flashbacks of the faces of Sayaka Fujiki (Anna Ishii) and Hasebe, who drowned during a previous training session, and he can't stop trembling.