The "Yanagawa Ariakekai Aquarium," home to animals in the Ariake Sea such as indigenous fish species in Yanagawa's canals and the grass carp of Chikugo River, opened in Yanagawa City in October 2016. After its predecessor had to close, the "Ariakekai Juku," a group of students working towards the restoration of the Ariake Sea, decided to take over. Building on a youth network based around this small waterfront aquarium, we hope to develop a circle of people wishing to protect the natural environment.