The Mecha Emperor's Low-Key Way of Life

That guy actually died in humiliation at the wedding of the woman he loved! Luckily, his soul somehow transmigrated.

But when Prince Sozora came to, he discovered he was a fat pig, two meters tall and two hundred kilos.

His younger sister was an idiot, his fiancee had come to break off their engagement, and the enemy army was at the gates. Even with his mechanical modification abilities, it seemed he couldn't pilot a Gundam and save the country.

What should he do? How could he be a good crown prince, older brother, politician, military strategist, thinker, and tactician all at once...?