In 'Hello, Whose Nightmare?', players step into the shoes of an underappreciated barista named Sam, who discovers an ancient, cursed coffee machine while cleaning the storeroom after a long shift. Each time Sam brews coffee with this machine, it opens a portal to the darkest fears and anxieties of the customers entering the café. With each cup served, the player must interact with the customers, engaging in dialogues that reveal their fears while trying to keep the café running amidst escalating supernatural occurrences and mind-bending challenges. Can Sam confront the nightmares that emerge, collect essential clues, and save both the café and the customers from the abyss of their own making?