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.