Histoire
It's no understatement to say that the stormy relationship between Nagi and her butler Hayate is often the result of the fact that they see things from entirely different social perspectives. However, when Nagi decides to bring Hayate, her maid Maria, and their friends to a secluded vacation retreat, our star-crossed couple soon find themselves seeing things from completely conflicting realities! In a bizarre turn of fate, Hayate finds himself in a world where his mistress is Maria, and Nagi no longer seems to exist!
Synopsis via AniList (en anglais).