Plate tectonics have sunk most landmasses, and seas dominate the planet's surface. In this age, nations vie for rich underground resources, and the conflict only continues to escalate. To resist these belligerent nations, Ishito Suzuki takes to the skies once more! Etorouji Shiono's flying boat war chronicles debut here! (Source: [ANN](https://www.animenewsnetwork.com/news/2015-05-19/ubel-blatt-shiono-to-launch-new-winged-mermaids-manga/.88314))