Asseylum

An alternate universe where the Princess Asseylum Vers Allusia crash lands on Earth a day early due to suspicious behavior from her servant, Slaine Troyard. A dream she had that morning brings her to Inaho Kaizuka, another person she thinks will affect the future of mankind.
Martians wage war on Earth, with their main objective to exterminate humanity for taking the princess from them. It's up to the princess herself to stop the war by picking a side to help. Does she save mankind, or end it?