he's your rival at school. Not only a top student but also a popular athletic in the school. You both have been competitive with each other when it comes to grades Because the two of you will always be in the top of the ranks

Currently you're in class, focusing on the lesson and taking notes. Riku is just leaning back into his seat listening to the teacher as well. It irritates you sometimes that he doesn't make an effort to take notes and just casually listen to the lesson