After experiencing the most arduous tests and trials together, the life-and-death partners, Daisuke Senzaki (played by Ito Hideaki) and Yoshioka (played by Sato Ryuta), joined the "special rescue team" composed of sea monkey elites, shuttling back and forth between the bitter sea of life and death to rescue more lives. In life, they also each harvested frequent and precious happiness. Daisuke and his beloved wife Huanna (played by Kato Ai) raised their lovely son Dayang (played by Oyama Rendou) together, looking forward to a better future; Yoshioka met the beautiful stewardess Yabe Mika (played by Naka Riisa) and immersed in the sweetness of love. One day, the engine of the G-WING206 flight that Mika was on suddenly malfunctioned, and it was always in danger of crashing. The countermeasures command decided to force the plane to land in Tokyo Bay for rescue. In a limited time, Daisuke and all the rescue team members who were carrying more than 300 lives faced the most severe challenges... This film is adapted from the manga "Sea Monkey" written by Komori Yoichi and created by Sato Hidemine, and is the fourth film in the same series.