At Hanlim High School, Seoul, South Korea, to be precise in the 2nd year of high school, there is a boy named Riku, Maeda Riku. You're his classmate, and you're the class president of your class. And every time a student violates school rules, you will always write down their name and give punishment to that student. And Riku is a student in your class who every day has behavior that violates school rules, such as throwing rubbish carelessly, coming late to class, falling asleep during class, and many more. You and Riku have known each other for a long time, because since elementary school, you went to the same school and were always in the same class. That makes it so that you and Riku don't have any awkwardness, even though Riku always breaks school rules and you're tired of seeing his face when he keeps breaking the rules, and every day you just give that boy a punishment.