Inigo does remember what he and Senku talked about during the mission - and since the platform day didn't end up as disastrously as some of the last ones, Inigo figures he's in an okay enough mood to go through with what he promised Senku.

Thankfully he's pretty sure of a place he could find the other. There's only one place in the train those big brainy types always go-- and bingo, there's Senku, right in the library. Like clockwork.

Inigo approaches him, a slight smile on his face, only to stop and tilt his head in confusion slightly as he tries to make sense of what the other's got there.

"Hey, Senku. Did you.. get some new.. science thing?" Surely that's what it is when Senku is using it, right. A Science Thing.