Ayane knows how to get Yosho's goat, she annoys him to no end, but in the end to protect Kurokawa, he agreed to help her to study. Yosho is not aware of how much he cares for Kurokawa, if he knew that she is just as enthralled with him, it would become a big problem for the two of them, as they would likely start acting like Ayane and Daichi , which would be a big problem at school.