They Say I’m the Ruler of a Fallen Empire [Interstellar]

Two male leads / married first, love later / top / equally powerful leads / interstellar / mecha

A humanist, an emperor-level top who puts on a peacock display the moment he comes of age × a slow-witted, cool and adorable, looks-obsessed Imperial major general, bottom

Feng Xingzhou / Augustus x Snow

*

After an assassination attempt, Feng Xingzhou awakened memories of his past life and discovered that he had transmigrated into a book, as a monarch whose country was doomed to fall!

Not only were his legs crippled, but he had a fiance, Snow, who was destined to end up with someone else.

A succession struggle raged within the empire, while the insectoid race threatened it from outside.

The old emperor changed his mind overnight, and his fiance became his actual wife.

Feng Xingzhou: Is this really my lucky day?

Snow: ...

*

As the empire's only SSS-grade Omega and a high-ranking officer despite his young age, Snow had long been prepared for a political marriage.

At least, as someone who was crazy about good looks, he could take comfort in the fact that his future husband's face was certainly easy on the eyes.

But... what was with this man in front of him, who kept showing off like a peacock at the drop of a hat?

Political marriages weren't supposed to work like this, were they?

Weren't they supposed to be polite, respectful, and keep out of each other's business?

Then, once the time was right, load a little animation and say goodbye?

*

A rumor that the Third Prince's legs were crippled suddenly broke out on the Imperial Forum.

Just then, the insectoids invaded, their forces massing at the border.

The next-generation SSS-grade mecha, Solar Flare, made a stunning debut and proved unstoppable. When the battle ended, a face capable of captivating all living beings stepped out of the mecha, and the entire empire erupted.

*

In the face of the insectoids' schemes:

Augustus, the 134th ruler of the Astra Empire, solemnly declares to all humanity:

Admit it. You simply can't stand those bizarre-looking aliens...

We will reclaim the beliefs of our ancestors and send a call to arms against every alien species that seeks to overthrow humanity...

Let us set the starry sea ablaze!