Shuumatsu no Maristella

Shuumatsu no Maristella (終末のマリステラ) is a manga series by Chiharu Takano. It was serialized in Comic Flapper.

Plot
In the future, space has been destroyed, and only a small portion of humanity remains alive. A group of winged girls called angels must fight against the flying marine monsters attacking from the oceans.