After the discovery of a hypergate on the moon enabling travel to Mars, settlers found advanced technology known as 'Aldnoah.' This led to the creation of the Vers Empire of Mars, sparking a war with Earth's inhabitants, the Terrans. A catastrophic event, 'Heaven's Fall,' resulted in the destruction of the moon, forcing a fragile truce between the two planets. Fifteen years later, high schooler Inaho Kaizuka witnesses an attempt on Princess Asseylum Vers Allusia's life, causing the ceasefire to collapse as war reignites. Now, Inaho and his comrades must confront the powerful Martians to end the conflict once and for all.