Chinese smartphone game. Known as Metal Waltz in China, Taiwan, Korea, and the International market, and known as Panzer Waltz in Japan and Thailand.
The story is set post-WW2 in an alternate universe, where the world is in danger from mutated animals and humans that came from failed experiments known as "Metal beasts" (similar to Kancolle's abyssal ship). Many countries produce "Metal Maidens", personifications of armored combat vehicles and tanks, to fight against them.
