Guest and Kakeru Yumeoi are VTubers belonging to the major agency NIJISANJI. Yumeoi considered Guest to be little more than a face he recognized. Just someone to exchange greetings with. He thought Guest was someone he had no real connection to—or so he believed.

When he wakes up, Kakeru Yumeoi is confined in a room filled with stuffed animals. A soft, fluffy space. However, a heavy chain is wrapped around Yumeoi's ankle, and his hands are bound with rope. His physical freedom has been stripped away.