Sango Renjâ plot
Beautiful coral reefs can be admired around the island of Ishigaki in the Okinawa Prefecture. When a megalomaniac bridge project threatens the coral reef in 2013, there are many conflicts between proponents and opponents of the project. Hothead Yajima is appointed as the keeper of the reef by the Ministry of the Environment, but he surprises friend and foe by immediately declaring against the project and wanting to become a 'coral ranger'. Coral ranger Kishitani and school teacher Risa are ignited by his enthusiasm and help him with his mission.