The October issue of Kadokawa’s Comic Alive magazine published the final chapter of the High School Fleet: Maidens of Loreley (High School Fleet: Loreley no Otome-tachi) spinoff manga on Monday.
AAS/AIS and Kanari Abe launched the main manga adaptation in the same magazine in October 2015, and the manga is ongoing.
The original 12-episode television anime series premiered in Japan in April 2016.
Because of a shift in tectonic plates around 100 years ago, Japan lost much of its area to submergence.