The Lovely Mama Nagant

https://archiveofourown.org/works/62708740/chapters/160535905

“I would like to thank you for finding my daughter, I was worried about her. Could you please return her to me?” The masked villain continued, clearly not actually caring about her well-being. At that moment, something snapped. Maybe it was the sleep deprivation coupled with the stress. Maybe it was the sight of a child that looks like she’s barely in elementary age being scared like a damn quirk war veteran. Maybe it was the obviously evil fucker standing in front of her, rekindling whatever sparks of heroism and maternal instinct that was left in her heart. Whatever it was, her mind only had one goal now. Protect. That. Child.

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In which Kaina Tsutsumi manages to trick and deal her way out of Tartarus, bump into Eri, kill Overhaul, and go back to Tartarus. Back in Tartarus, she laments her decision, but is contempt with saving one last person. Until a certain rodent shows up.

Original prompt by u/ofUncertainPenguins