I Became the Narrow-Eyed Character in the Little Prince Game

The largest underground city in the Empire—the Kingdom.

A domain once ruled by the Sovereign, who had been known as the pinnacle of the underworld.

True to its name, the Kingdom boasted massive scale.

Comparable even to some major cities on the surface... and yet it lay buried deep underground.

According to the original setting, the imperial capital had once been located near this area.

It likely served as both a tourist destination and a refuge.

But—

Roughly a hundred years ago,

A massive earthquake struck the region, causing devastating damage to the entire capital.

The ground became unstable, and the underground city was suddenly at risk of collapse.

One by one, people began to leave because of the danger.

Even the emperor of the time chose to relocate the capital.