In 'Whose Diary is it Anyway?', players step into the shoes of a struggling playwright who discovers a mysterious diary at a theater. The diary contains the thoughts and secrets of various characters from different plays, each revealing hidden truths about their real-life counterparts. As the player navigates through immersive narrative choices, they must piece together clues and construct a new play that ties all the secrets together before the theater's closing night. Each character has conflicting interests, and the player's decisions will either lead to a bombastic reveal on stage or a catastrophic flop, offering multiple endings based on their investigative skills and friendship dynamics.