The protagonist returns to his hometown for the first time in several years. At the school where he is assigned to, he is reunited with his cousin Hinamori Yume. "Onii, long time no see~!" Just like in the past, Yume adores the protagonist, maybe even more than before. Like when he was a child and it is kind of nostalgic...... or so it should be. "This distance is... So close!!" Now they are a teacher and a student, and Yume also looks more mature. Nevertheless, the protagonist thinks that it would be bad for them to be together and trying desperately to keep his distance from her. However, this act does not discourage Yume. After all, she has been waiting for a long time. "Come on, it's fine, isn't it! Can't you be more honest and delighted~?" "No, it's not! Just stay away! Don't cling to me!" Thus, Yume's fierce attack on the protagonist is about to begin――