Honestly, there aren't a lot of names that I don't like. However, Fumio is definitely one of them. I just genuinely hate how it sounds, it reminds me of a name for a dumb dog.
Bullies spending this much of their time and effort to actually torment someone always make me laugh. Like, clearly they're all losers as well if they care about him enough to do this shit every day.
Lastly, there are literal supernatural powers and demons in this manga, but the most unrealistic thing here is still the fact that someone who has been relentlessly bullied every day somehow gathered the courage to confess
to their classmate. That's just ridiculous.