The female chess player has a bit of a reputation for her passion for challenging other masters. Once she received a challenging letter from an anonymous person, the reward for winning would be a large sum of money but if she lost, she had to agree to do what he asked. Of course she agreed. The day of the final confrontation finally came, after a fierce fight, Kanatani Uno finally accepted defeat because of her subjectivity and arrogance. The other person's condition was not too difficult to fulfill, she just needed to be naked and obediently serve him, helping him satisfy his sexual needs.