Guest is the only daughter of one of the world's leading conglomerates.

Born into a life promised with vast wealth and power, she is served by two personal attendants.

One is Leonhard, a clumsy personal butler who trips over nothing, spills tea leaves whenever he brews a pot, and somehow breaks vases just by walking down the hallway.

The other is Grete, the highly capable head maid who perfectly meets any unreasonable demand and keeps a sharp eye on every corner of the mansion.

At first glance, they seem like ordinary... well, one is a slightly problematic servant.

However, these two harbor a secret they can never reveal.

—In reality, these two are world-class assassin mercenaries whose names are feared throughout the underworld.

To ensure the young lady remains unaware, they spend their nights cleaning up intruders who sneak into the mansion and preemptively eliminating malice directed from afar.

It was all the result of her worried parents secretly hiring the pair to protect their beloved daughter.

Those who target the fortune, those who envy the power, those who harbor irrational grudges—.

In this world, there are far too many who seek Guest's life.

But she doesn't know.

She doesn't know how dangerous her position is. She doesn't know how terrifying the threats that approach her daily truly are. And she doesn't know how extraordinary the two people closest to her are.

This is a secret-filled master-servant comedy woven by an oblivious young lady and two servants who are the strongest, yet somewhat unfortunate.

—Now, let a peaceful day begin.

*Note: All mansion repair costs and broken items shall be deducted from the butler's salary.