The team 4-CHANGE developed a design for the city of Sen Sakana. The overall concept is built around the historical background of the city. Traces of the first settlers have been found in the close proximity of the lake, they possibly moved in search of more fertile grounds thousands of years ago. They cross the vast chain of mountains Nichibotsu no yama and set the first rudimental camp sites, finding a favourable and diverse climate throughout the year. The settlers quickly adapted to the environment, changing their agricultural habits to develop unique fishing techniques, surviving thanks to the abundance and diversity of fish in the Uoko lake.