Eiji nods slowly. It's...well, it's logical. It's something he can handle hearing. Chase isn't telling him that it's okay, that of course he's going to worry...but that Eiji's not hurting him by putting this burden on him right now. It's something he hasn't heard, or had any reason to think he'd hear.

"It's...hard to explain."

A full explanation requires going into explanation of desire, the Greeed and Yummies, and OOO itself, but he doesn't have the brainpower to handle that.

Another breath later and he's able to explain, "They feed off of...well, the lack of desire in my heart. They want everything to stop existing. I don't have anything that can stop them."