Koushirou hasn't exactly been purposefully avoiding people, but he hasn't been seeking them out either. It's less about the people and more about having other priorities--exploring, gathering supplies for daily survival, working on solving puzzles--but it had just so happened that few of those thing had overlapped with being social.

But this is a little different. Working together is not a bad idea and, more importantly, he knows better than to pass up 'free' food or supplies. Of course it could be a trap, but that's probably unlikely in this particular case.

So he decides to show up, a little cautious but mostly curious, and immediately gravitates toward the food first. He's pretty quickly distracted by considering the cooked spiders and wondering if they're really edible--he knows a lot of 'normal' spiders at home are, but these aren't exactly normal--as well as figuring out what in the collected boxes and cans. Are those alternate-dimension twinkies?

Aside from being nosy, he can be found at the outskirts of the gathering area, sitting on the ground and typing on his laptop. He's keeping at least a little aware of his surroundings for once, but most of his attention is on the various images and the text file he's working on; if anyone happens to look at his screen, it's clear he's working on the writing system.