Thanks for the translation, but this story feels like it's written by some middle school kid or something. As mentioned by some other people below, the "parasite" term just feels weird because the party was supposed to be a kind one, and after questing for six months, the moment Sora announces his rank everyone turns against him??
Also Sora is just a shitty conflicting character. He has this side of him that has pride as an adventurer, but somehow gets pressured to collecting illegal herbs by some thugs, and still thinks he can open up a herb shop without any consequences. He also knows that people are going missing in the forest, but doesn't care about this situation. When you know people are going missing, small monsters ignoring you and running for their lives, and even see a C rank party gtfo, you do just that! Who tf stares at what is coming right at them and wonder why such a boss is doing there???