Either thats a new character, this late in the game, who we get barely anything about in their introductory chapter...or a throwaway character, making this a non-content chapter. Unsure which I'd prefer, honestly.
If there's an epilogue coming, alright, fine, that works.
If this is it, that's very disappointing.
Yes, you can guess "juvenile crime, few years of jail and then she's out to get a happy ending", but come on, finish your work.
I remember like 10 chapters ago, when I thought "huh, not every day you see a harem manga where not Literally Everyone is an interest, nice to have a character supporting others and being stuck in an awkward spot because they wanna help everyone. Im curious to see where this goes!"
And here we...