In 'Whose Diary Is It Anyway?', players step into the shoes of Jamie, a hapless office worker who discovers a lost diary filled with bizarre and hilarious entries. Rather than returning it, Jamie decides to unravel the mysteries of the diary by adopting the persona of its mysterious owner—an eccentric character who has inadvertently become the talk of the office. As Jamie navigates through a series of madcap situations, players must choose their words carefully and manipulate conversations to gather clues, mislead co-workers, and uncover the diary's author while hilariously entangling themselves in absurd office antics. With a vibrant cast of co-workers and side characters, the story unfolds based on the choices made, leading to multiple outcomes and comedic revelations.