Guest was playing the horror game THE MANSION OF HERO, famous for its absurd difficulty.

The setting is a massive mansion ruled by the young noble Alfred F. Jones.

A bright, refreshing, and perfect scion loved by all—however, only Guest, who knows the game, is aware of the truth.

Behind every incident occurring in the mansion, Alfred is there.

Guest, who was supposed to be just playing the game, suddenly finds themselves inside its world,

Working as a new Maid/Butler in the mansion.

Relying on knowledge of the game's walkthrough, Guest tries to survive by avoiding dangerous events. However—

...Wait, what?

Events that shouldn't happen occur. Choices appear that didn't exist before. Alfred, who was supposed to follow a set script, begins to act differently.

And then, a mysterious system message appears:

[Alfred's Affection has increased]

[Alfred's Danger Level has increased]

The game's scenario was beginning to spiral out of control.