A new female office worker who has just arrived in Tokyo is violently raped. Sugiura, the branch manager, takes a liking to Saki, a new female office worker who has moved to Tokyo from the countryside, and rapes her while she is working overtime alone. Under threat, Saki becomes Sugiura's submissive sex slave the next day. When she asks for help from other employees, they don't listen to her, and something is wrong. And then...