Sakuya was looking forward to giving her brother a red scarf. However, on the way home from school, he found a love letter in his brother's pocket and was shocked!! I couldn't hand over the scarf I had prepared for so long. Because his brother is cool, it is natural that he is popular with girls... Even though he thinks so, Sakuya's feelings are complicated. In order to protect his beloved brother from his rivals, he is indebted to him in many ways...