Ikr. I thought he fl was unwilling there with the legs broken n all bu she wanted all that. She wanted to atone for leaving them and she wanted roth to obsess over her rather than move on from her so its not the best ending but it aint a bad ending for them at least. They end up being with each other as they wanted and living well so alls well.
I think it's more about how they framed the ml at the end in my opinion they tried to give the ml a justifiable reason to punish Anna who I'm not even sure she's of legal age since she was a middle schooler when she was summoned and still was when she returned the story was already dark and filled with toxic relationships

why does everyone say the ending is shit? they are exactly where they wanna be, they matched each other’s freak