If you're looking for manga similar to Kantai Collection: Kan Colle - Shimakaze Tsumujikaze no Shoujo, you might like these titles.
Yukikaze is just a young girl but her and her friends have the incredible responsibility of being the naval force of her nation. As part of Seiran Team 3 of the Wadatsumi naval base, Yukikaze and her female friends, Isokaze, Nowaki and Takao, all attend the naval academy. But in this world, they do not work on ships, instead, they themselves are the weapons, able to travel across oceans at high speeds and engage in warfare using their equipped artillery. When an enemy nation attacks the base to take control of an important strategic point, only Yukikaze is left standing and all hope seems lost when a beautiful woman named Taiwa appears with the secret weapon to defend Yukikaze and the naval base.
Kagerou, a Kanmusu stationed in Yokosuka Naval Base. As the nameship of the Kagerou class, she pushed herself to do her best in training, but things didn’t go very well. In reality, Ushio, Arare, Satsuki, Nagatsuki, and Akebono—Kanmusus that were added into the same fleet as her—caused by their respective reasons were all failing Kanmusu who could not get themselves a place in other fleets! Kagerou, with her stationing delayed and getting in last out of all of them, finding herself stuck in such a fleet and thus, her daily life in Yokosuka Naval Base began.