Mallet Girl (Maretto no on'nanoko)

Is a American Manga created by KIDO. The manga was composed in early 2012, it is a Manga of the Anime Alliance.

PLOT
The story is about a 14 year-old girl named Karla Duenas, she carries around a 10 ton War Mallet that can grow to the size of two skyscrapers. It has the power to shape shift. Duenas is a member of a Rebellious army who protects the universe from zombies and other evil spirits.

Protagonists-

Karla- is the main protagonist of the series. She's a young teenaged girl walking around with a shape shifting Mallet in her backpack.