Yuna works as a concierge at a luxury hotel in Tokyo. One day, she visits the room of an important customer who is also a shareholder to deal with a complaint, but her "bad attitude" angers the customer even more. It's actually a trap set by the customer to seduce Yuna, and she is strangled and knocked unconscious. From there, the terrifying hotel confinement training begins. Restraint humiliation play, toy orgasms, throat fucking, and raw sex. Gradually, Yuna's mind starts to go haywire.