Rei Ohama is the representative of a new apparel planning company. The company has been doing brilliant business by discovering promising designers and making their debuts, but it also has a weakness in terms of funding... Investor Sawada is very interested in the company, and secretly sends in secretary and slave mistress Tsubaki Yamaguchi to plot a takeover. Tsubaki fills the gap in Rei's unfulfilled sexual desire and seduces her with her honed lesbian techniques. She introduces her to Sawada and presents her to him, but soon becomes Kokoro, and Sawada uses her for sadistic play.