Oshima, the president of a large company, decides to hire a high-class private tutor to prevent his son, who failed to pass the exam, from becoming a second-year student. - The monthly fee is 500,000 yen. - In case of failure, the fee will be fully refunded. - Michiru Kujo is an extremely highly educated super tutor who was introduced by a tutor agency for wealthy people who is absolutely confident that she will pass the exam. - When they meet for the first time, Oshima feels an evil lust for Michiru's overwhelming beauty, and he puts drugs in the tea he serves during their break...