Unhappy ending that feels like a happy ending

I'm looking for twisted happy endings. Maybe the protagonist dies, but does so happily because it's better than the alternative. Or maybe they get absorbed into the alien hive mind but think it's beautiful. Massive bonus point if there's sneaky foreshadowing or they start struggling with that perspective early on, not just as a final plot twist.

I'm not picky about the genre, but I'm iffy about dark romance/crime for this. If you have suggestions in these genres, please no rape or other sexual violence. I'm not looking for "victim succumbs to violent kidnapper" stories.

Thank you!!