High School Fleet

Living by the coast, guarding the sea, and roaming the ocean—these are the hallmarks of the Blue Mermaids. A century ago, a shift in tectonic plates caused Japan to lose vast portions of its land to submergence. In response, coastal cities rose one after another, evolving into marine metropolises, and as sea lanes expanded to connect them, a substantial corps was needed to patrol the seas. At the same time, maritime careers began attracting more women, turning the Blue Mermaids into the coveted dream vocation for female students everywhere. The story follows childhood friends Akeno Misaki and Moeka China as they enroll in a Yokosuka marine high school, alongside other girls who share the goal of becoming Blue Mermaids.