Tenchi patrols the hallways after lights-out, notices lights on, and discovers Yuki and Rui bent over some contraband ramen like a couple of junkies. However, they offer him a cup and he goes easy on them. As they tuck in, Tenchi learns a lot more about the Science Club girls.
For instance, while Fuka built Gouriki’s basic structure, she has no idea what powers him; that Kinojou isn’t technically a club member and has no memory of her past, and Fuka and Rui are simply helping her look for…something. Gouriki’s head’s “treasure detector” indicates is below their dorm, but they find nothing and Yuki shoos Tenchi away.