Kanmusume Cultural Festival is here! The Kanmusume Cultural Festival is being prepared based on the proposal of Secretary Agano. In a special sea area where the Deep Sea Fleet does not appear, the Kanmusume are enjoying experiences they've never had before at the naval base. Amidst this, an unusual event occurs with Kasumi, who believes that fighting is the true purpose of a Kanmusume, as she focuses on her training──.