Bumping! I've been toying around with the Titanfall-esque plot.
Several hundred years in the future, humanity has spread to the stars, and have colonized dozens of new worlds in the Milky Way. As time went on, tensions rose until they reached a breaking point, resulting in war across known space. One little planet has decided to remain neutral during the war, and continued life as usual. Its forests were felled, its seas fished, and its mountains mined. One day that all changed. Massive creatures rose from the depths of the sea, laying waste to coastal cities for weeks before they were killed by the planet's military forces. At first it was thought to be a one-off incident. But as more creatures - dubbed "Tenshi" by the media - began appearing, a task force was put together to fight them.
Persuaded by outside sources, the planetary government began importing humanoid machines known as "Hachiman" in order to combat the Tenshi.
Well, pilot? Are you ready to fight some Tenshi?