Kyou kara Shimobe!  

今日からシモベ！

It appears that the situation between Nitona-kun and Mamai-chan has reached a critical point. Despite growing up together and living close to each other, Mamai-chan has consistently treated Nitona-kun as her subordinate. Meanwhile, Nitona-kun has developed a sexual relationship with his classmate, Shirai-chan. While Mamai is attending a student council meeting after school, Nitona and Shirai sneak away to spend time together in private. However, their actions are discovered by a surprised Mamai, who happens upon them while they are having sex. The twist? Shirai claims that it is actually Mamai's fault for the situation. Will the truth finally come out?