In a world where voices resonate and can manifest into personalities, players assume the role of a voice investigator in a bustling metropolis. Your mission is to uncover the identity and intentions of a mysterious figure who has been sending cryptic 'hellos' through the city’s communication channels. As you engage with various NPCs—each representing a different voice from the city's past—you'll gather clues, manipulate conversations, and piece together a vast conspiracy that spans the decades. The choices you make influence not only the outcome of your investigation but also how these voices perceive you, leading to multiple endings and outcomes.