This game is inspired by Godzilla and Primal Rage. 

Basically, you make your own Kaiju, and that's your character. Kaiju are intelligent, like people in this game, can be actually good or evil, and not necessarily dumb animals. 
The world has been mystically altered into a different dimension over time, after an Apocalypse struck the Earth. The world is subtly trying to adjust through the Apocalypse through magical means, altering reality everywhere, to compensate for the destruction and sudden changes brought by a meteor that struck the world centuries ago.

Only one civilization remains, New Albion, which is in what was once the United States of America, Canada and Mexico. They have built extremely powerful war machines to keep the creatures and horrifying monsters out. Their technology is extremely high, to compensate for the fact that the Kaiju roaming the world are so incredibly powerful.

For this game, Dragons can count as Kaiju, and do, in fact, exist, as do Phoenixes and the like.