Those who are at the top of a zaibatsu, a large Japanese business conglomerate, tend to have eccentric tastes. For one particular executive, his hobby of choice is spending his fortune on women, buying sex slaves naturally. At his luxurious mansion in the most remote of locations, he spends his time training his pets far from prying eyes. An acquaintance of his shares the same pastime, and the two one day decide to compete to see who can train the best sexual servants. At the same time, an amnesiac young lady shows up at the doorstep, not realizing what awaits as the game begins. Yuu is a girl who has lost her memories. She is mailed into a sadistic house of bondage where she and others are forced (or not) to serve their master, Renji, but there are serious consequences for those who fail.
