Kantai Collection: Shimakaze Tsumujikaze no Shoujo  

Kantai Collection -Kan Colle- Shimakaze Whirlwind Girl, 艦隊これくしょん -艦これ- 島風 つむじ風の少女

The world is currently experiencing isolation because of mysterious deep sea creatures known as the "Deep Sea Fleet." These entities have taken over the seas, separating all countries from each other. In response, nations have united to create a powerful weapon called the "Fleet Girls" that can match the strength of a battleship. The success of this new weapon in defeating the Deep Sea Fleet is uncertain, as well as whether an ensign sent to the naval base where the Fleet Girls are kept will be able to aid in their fight against these mysterious creatures. Only time will reveal how this war between humanity and the Deep Sea Fleet will unfold.