Whose Hellos Are These, Anyway?

In an alternate reality where people communicate via an eerie yet amusing series of greetings, you find yourself as an investigator in the town of Grinville. The townsfolk have begun to lose their ability to interact normally, leading to bizarre misunderstandings and hilarious consequences. Your mission is to unravel the mystery of the enigmatic 'Hello Thief' stealing greetings by investigating quirky characters, piecing together clues, and navigating through a web of social faux pas. Will you restore normality to Grinville or get lost in a sea of strange salutations?