In 'Whose Item Is This?', players take on the role of a snarky detective in a bustling metropolis who stumbles upon a mysterious collection of abandoned items scattered throughout the city. Each item comes with a quirky story and hints about its original owner, leading to a deep web of connections and secrets. As players delve deeper, they must interview various eccentric characters, solve puzzles, and piece together clues to uncover the truth about the items' owners. With each discovery, the player's choices shape the narrative, leading to multiple potential endings based on how well they navigate the web of relationships and solve the mystery.