The realism is a bit wonky in this story though. If I'm not mistaken, the adults should have powers too but for some reason they're not doing anything to stop teenagers from turning into literal crime lords.
Like, the only thing they did with their authority is force them to attend an ability school. They don't do anything if the MC gets beaten half to death on campus or even bother to check on students who never show up like Ririka (who apparently never even attended, she only used this place to trick and enslave girls to get some ransom money from their families). Man, I wish the teachers actually tried to do their jobs.
Yea, author looks like he's going the "turn every female character into irredeemable monsters" route to justify MC stealing their bodies/lives and leaving them stuck as ghosts forever.
Maybe the fact that the old man claimed to be able to sense spirits as well is misleading, but I'd wager most adults do not have abilities. Abilities appeared in the year 2000, and only to newborns. Based on the first chapter, if we assume the year in the manga is the same as in real life, then nobody over the age of 25 has an ability.
Alternatively, the 1st chapter stated that only 1 in every 20 people has an ability...whether this means the year is much more advanced forward than 2025 or if there's really just that few people born with them, that places ability users into a very elite club. Note also that includes men, meaning maybe roughly 1 in 40 humans have an actually useful ability. With this in mind, even dedicated educational institutions might have teaching staff who are all ability users, but inferior to the top students.
Most teachers are probably either powerless, or not many can match the top students. Even if a few powerful ones exist, they are likely few in number and may need to engage in a bit of give and take with students to control them. This author has gone to some effort to world build, so I'm assuming no random details. In that case, it makes sense to reason that the top students (aka the ones with the most powerful abilities) are being promised future prestige and power. In exchange, they maintain the hierarchy that has been built into the school by keeping less powerful ability users under their heel.
We see this in practice right from the start. Problem students and other issues with abilities are dealt with by the student council, who are clearly full of monster ability users, and not by teachers. It's also the usual Japanese school policy IRL and trope in manga, but the author has made use of that rather than it being coincidental, given how he as constructed the character of Hiroto's sister as the student president and the virtually aristocratic hierarchy of the school.
Even putting that all aside, I honestly do not see any problem with how the female students are. Even if they had teachers over them, they're likely 1 in 40...the more powerful ones among them are even rarer. Maybe the teachers don't give a shit either, they're ability users too. It's easy for such a group to come to look down on others and assume the rules don't apply to them...or those like them.
On another note, Akemi seems getting flawless at acting as Nirasawa. I wonder if that will cause issues later. Betting they'll capture Prince by having Yamada/Ririka do it...nobody said it had to be Hiroto himself.