In a world where echoes hold the secrets of people's pasts, players take on the role of an amateur echo investigator navigating a bustling metropolis. Each echo heard reveals a fragment of someone's life — a long-buried secret, an unspoken regret, or a hidden crime. Players must decipher these echoes, connecting the dots between different characters, and solve a series of interconnected mysteries that reveal a larger, more sinister plot. As players interact with locals, they can choose to sabotage or assist their quests, resulting in multiple endings that reflect the choices made throughout the game.