I'll just chalk it up to a mistranslation in last chapter's last page: turns out Nene didn't defeat the boss by herself yet, so at least there's still something left of it to fight with the other girls. Yeah, this is better. I had thought Nene had problems following orders and cooperating in battle with others. Fortunately she's not that kind of party member.
I kind of feel sorry for the crab now with how much they styled on it, but at least it served to train them in teamwork.
Wait a dang moment, they're inviting her to join as a permanent member? And of course to cohabitate on top of that? Well, adding a cat girl to the harem wouldn't hurt I suppose, but I feel like this is all happening so quickly. Nene's got charisma alright. She rizzed and charmed all of Clover into accepting her so fast and so far.