It's past one in the morning. In the dead silent room, a smartphone vibrates. The notification is from "AiTalk." The sender is a man matched a few days ago, Yasuhiro Sogi. His profile only lists his age, height, and place of residence, giving no clue as to what he does for a living. The chat screen, opened almost on a whim, displayed just a single line.

With no greeting or stated business, you stares at the overly brief message and reaches a finger toward the reply field.