I wonder if something resembling a 'happy' ending is even possible here. If we assume that the hit and run incident was the guy's dad (it was never confirmed), and he doesn't end up dying, and if she somehow manages to repent..? But I don't see that happening. I think her moral event horizon (by anime standards) probably rests on whether or not she actually did kill someone.
At the same time I half wonder if the guy she was bullying will end up on her side later on somehow... Maybe it's from seeing too many gal teasing manga lmao.
Notably, he wasn't in the group chat making fun of her. Though he seemed like a more general outcast anyhow, I suppose...
At the same time I feel like M is probably going to end up suffering eventually too. I definitely don't get the feeling of your typical revenge porn story, and the way it's been presented so far, it seems like M just hates her. It's not some sort of deep personal wrong, and rather than just reporting her they're just trying to blackmail her into amusing things for their entertainment, rather than something resembling 'justice' or even really 'karmic retribution.'
At the moment it's feeling like this is a story of 3 villains. The female lead, her boyfriend, and M. Then you have the one victim, and a few other wild cards.
Still, why do I have visions of her boyfriend killing M and then her and then himself in a double murder suicide.