(Art credits @xingooo on twt)

Rui was busy at his desk working on a blueprint for a new part on he and Tsukasa's spaceship. He was writing in a journal too. It looked like he was recording his research, or something.

"And this goes here..." Rui whispered to himself, sketching out another line.

Although you couldn't understand a thing he was doing, he seemed very focused and determined.