I possess a rather peculiar power: I can understand any language. This ability was bestowed upon me by a mysterious older sister I met when I was a child. Frankly, it's bizarre beyond belief.

Then, on my 17th birthday, I reunited with the older sister in a dream. She asked me to "help with interpretation work at a mansion in another world." I agreed, but when I came to, what was reflected in the mirror was—the figure of a cute, beautiful girl I'd never seen before. How could I possibly accept an explanation like, "Both staff and guests will find a pretty girl more approachable"?! Regardless, I ended up working as an interpreter and the shop's "poster girl" under the instructions of the overbearing older sister.

Then one day, beings known as "Heroes" and "Saints" appeared at the mansion. They had been summoned to save the other world, but there was just one problem. For an adventure in an otherworldly land where Japanese wouldn't be understood, they needed someone who could speak the local language. And the one who fit that description was—me, a beautiful but frail girl.

Before I could even ask, "Do I have the right to refuse?", I was forcibly dragged along on their journey. Unable to use swords or magic, my only weapon was the power to understand the languages of other worlds...!

This is the story of "me," who was transformed into an outrageously cute beautiful girl, and proceeds to systematically ruin the emotions and proclivities of everyone I meet.