Whose Hello, Anyway?

In a world where every salutation carries a secret, you play as a witty private investigator who specializes in the intricacies of greetings. Each interaction you have with the colorful characters in your quirky town reveals hidden truths about their past and a larger mystery involving a stolen 'Welcome' sign that controls the flow of social interaction. As you decode layered meanings behind seemingly innocent hellos, delve into branching narratives full of humor, unexpected friendships, and sharp humor. Can you unravel the conspiracy hiding in plain sight?