The drama revolves around Okinawa's Churaumi Aquarium, which opened in 2002 and was the largest in the world until 2005. Tokito Saburo stars in the drama as the aquarium's director. The story begins when he announces the plans for the aquarium's 7500-ton main tank, inspired by a boy fighting an incurable illness in a Hokkaido hospital. (Source: Tokyograph).