This storytelling is so bad...
Delinquents decide to spread rumors about them with crap like guy enslaving her, when everyone conscious is that skills can't be used outside dungeons.
By trying to do so in class they made everyone discover they did something bad in the dungeon, and no one had spread the info yet so it was a autogoal.
Delinquents totally ignore how their behaviour almost killed everybody and they got saved by the 2 they are harassing.
Delinquents try to kidnap the 2 to beat one and kill the other, protagonists see it coming from a mile and decide to ask for help with a pidgeon instead of a telephone call fo unknown reasons...and how did the pidgeon and MC know where the person he needed to pass the message was? Just call the guy.
Protagonists know they will be attacked when isolated from other people...and isolate themselves from people.
Protagonists put them down with ease, and one of the 3 delinquents beg them to go to the gang place so they can be beaten and raped, after trying to do the exact same....this makes no sense whatsover.
Note the guy was begging because he and the other had already promised the girl to the gang they themselves fear, and knew they would be the one beaten if they don't bring her.