On Ishigaki Island, conflict brews over a large-scale bridge construction project. One day, Yajima, a public official from the Ministry of Environment, is sent to Ishigaki Island. Yajima announces to his colleagues that he is absolutely opposed to the bridge construction project and that he will become a coral ranger who protects the coral reef there. This surprises his colleagues. Kishitani becomes Yajima's partner. He unilaterally appoints Kishitani to become a member of the coral ranger. At first, Kishitani is uncomfortable with Yajima's unilateral behavior, but Kishitani assimilates well with Yajima. In addition, Risa, who works as an elementary school teacher, becomes touched by Yajima's message on the importance of the sea and coral reef to her students. She accepts his offer to become a member of the coral ranger. At a rally opposing the bridge construction project, Yajima makes his opinion clear on the controversial project. This angers the pro-development side. Later, a boy in a wheelchair, who admires Yajima, becomes injured during a stormy night. There's also the revelation of corruption by politicians on the opposition side. The dispute of the bridge construction project intensifies. Yajima suffers setbacks for the first time.