One evening, as rain stitched the neon signs into a single blur, a courier slipped a slim envelope under his door: no return address, only a plain white card tucked inside that read, in tidy, indifferent script, “Bandicam. Keymaker required. Come to the Terminal.” Kaito frowned. Bandicam—he remembered the name from a friend who streamed gaming sessions and complained about watermarks and activation pop-ups. His hands itched with the familiar pull of a puzzle. He took his coat and the envelope and followed the smell of ozone toward the city’s older quarter.