I have to politely disagree with you on this one since it is heavily implied that the MC is interested in grade-schoolers due to the language he associates with his love interest (ex: "child-like, underdeveloped," ect). He only dates the guy in his class because he reminds him of a vulnerable kid. Even though he is still a high-schooler there is room for concern because he is already going through puberty and his mental state is very different from a grade-schooler's. With this power dynamic in mind being attracted to prepubescent children as a teenager is odd which makes the story not right.....
I'm deeply concerned not only by your comment but the amount of people that liked your comment. He's shown to be attracted to the grade schoolers visiting high school. He even thinks about it and doesn't tell his friend because he's aware he's wrong. So he conveniently finds someone who has the physical attributes of a grade schoolers and goes out with him and makes it clear it's because of his underdeveloped body. It's not just a matter of physical preferences he freaking likes kids in a sexuay way or you know like people like to call it: pedophilia
You have to be an idiot to say chapter 4's mc is a pedophile. Are you nuts? He likes a kid in the same grade as him. Also, people say they have perverted thoughts when what they mean is that they're thinking about sex a lot. There's nothing wrong with someone that young being attracted to someone in his grade at school. People making a big flap about it need to remember that young people think differently than adults. Even if they're both adults, there's nothing wrong with being attracted to petite people. Have you ever met a jockie?