The part where she notices he's actually pretty handsome AND notices his fancy luxury brand goods THEN starts contemplating it being a good idea to join the 3P.
@Riger He was going to let it go, and in fact had already given up and was preparing to leave, but plot kept him in the village a little bit longer, and ultimately she joined.
So the answer seems to be yes. If she just tells him flat-no, he will eventually call it a loss and move on.
Also, saying "my sword is better because of experience" feels like an excuse. His sword is better because he was taught bullshit alchemy-construction magic by a bullshit hyper-wizard. If she could use magic to rearrange the fundamental properties of matter and energy, I'm sure her sword would be significantly better, too.
@Riger that's what I'm thinking about. He says that he won't do anything until they like him but it comes across as not a matter of choice but a matter of time. Which seems pretty forceful.
Edit: I forgot that he was going to leave the elf village before the invasion went down. I guess it's just his wording that gives me mixed signals.
Either use Oruku in the chapter title or stick to Orc-san for his name. It bugs me that you are using the better romanization of his name in the chapter title and then going to Oruku which both looks and sounds terrible with English pronunciation.