The Quiet Guard (Underswap Isekai)

"A loud body. A silent soul. One massive identity crisis."

When a chronic introvert, Casey, wakes up in the body of the Underground's most ambitious skeleton, they inherit more than just cool armor... they get a body wired for constant action and a "backseat driver" who won't shut up.

Underswap Sans, the original host is now a persistent inner voice, a drill sergeant of optimism demanding puzzles, patrols, and social greatness.

Trapped in a high-voltage hero's life, Casey must fake the "Magnificent Sans" persona to keep a suspicious Papyrus at bay.

It's a race to see what breaks first: the introvert's social battery or the Sans's patience.

Being a legend is easy; doing it quietly is impossible.

💙 1 chapter/ per day until finished.

💙 Be mindful, not all introverts act the same like in this story.

💙 The accuracy is not 100%, I apologise for any misinformation.

💙 Enjoy your time reading!