Not much he could do in the overall situation, he can't fight, being blackmail, and his CHF got raped. His end game before the demon showed up was a one off that wouldn't have gotten him the satisfaction or closure for this situation. It isn't ideal but what could he do if the demon didn't show up with a better plan to get revenge.
I know he doesn't really have the power to do much else in terms of revenge, but he could at least try to help his friends? My main issue is that he just mostly glosses over the fact she was abused like that. He says that what he's doing is for her sake or for avenging her but he's just so... calm, yk? Like he's more worried about the revenge itself than about Azusa, so it just seems like he's using it as a way to get back at his bullies because they were his bullies, not for someone else's sake.
Ah I see where you coming from. Unfortunately seeing how the story going so far he isn't the brightest guy as the events turn. I really wanna know what the demon gains from helping him.
Not saying Chiaki and Hina aren't culprits as well, after all they DID bully the mc... but him using the fact his friend was r4p3d as motivation to torture those two just makes no sense to me. Bro says he's playing the long game but overall just mostly glosses over the fact Azusa got attacked like that; he saw the guy who did it, went "aye that's probably the one who assaulted her", then moved on with his life like I usually like revenge stories but this is NOT it chief...