u/Be-kah-chu

I only really remember a partial scene since it’s been so long.
I know it’s only a single season anime that won’t ever get finished as well.
The bad girl in the anime had a door open to have the main guy come with her so they wouldn’t get killed by a monster, but he goes to save the other girl and runs past the bad girl and the door closes causing the bad girl to get killed.
That’s all I really remember.
I tried looking it all up and even tried ChatGPT and I’m not getting any leads

TIA!