This is a Girls und Panzer spin-off, featuring the long-awaited naval battles!
That's right: instead of dramatic battle scenes fought from the ground, everything is fought in majestic attacks in open water out at sea!
It's the start of a new school year, and Shirei High, a venerable Japanese high school, is in dire need of funding to restore its dilapidated school building. Fortunately, the school owns a large number of warships stationed in 'underground' dockyards, but a scrap sale is impossible. The said warships are sport instruments for a popular cross-school, nation-wide sport involving naval combat. Despite their ownership of these machines, the government restricts their sale to only irreparable types damaged during an engagement.
Then it flickered: why not use these rusted boats to gain money by winning the annual tournament? Yet, it is true that the school hadn't participated for decades, and that the naval tactics class had been removed, but what could go wrong? Why not give it a try while you can?
Here, we follow the story of two second-year students, Aisawa Hitori and Naimura Kaori. They are surprised to hear that they will now have naval training for two days a week. Both knew of the high school's background, which included numerous wins and tournament finals. Kaori, who had always been interested in warships, began noticing that the warships the school used were identical to some mid-tier ships in her favorite game: World of Ships (not Mir Korabley, but a spin-off of the original by WG), such as the Amalfi, the Leone, the Roma, and even the Aquila. But something stood out, something that should be here. The light blue steel shining under the sun, Cristoforo Colombo, a four-quad-gunned (16) monster capable of devastating strikes from any angle, stood in her stands in the dry dock, as a sleeping steel beast awaiting just the right moment to strike the pride of other schools.