OBA-101 Sister's Tutor Aunt Sayuri Sayuri Ikuina

Sayuri was asked by her older brother, Ichiro, to become a tutor, saying, "I want Haruna, the daughter of an exam student, to teach me to study." In the midst of all this, there was a man who seemed to be in a frolicking mood. That is Haruna's older brother, Shinya. That was 5 years ago...Shinya, who was also a private tutor for Sayuri, couldn't forget Sayuri's intelligent profile even now. One day, Sayuri sees through the goodwill she had for her aunt. And Sayuri takes an unexpected action against Shinya...