He blushed lightly at the thought that Tidus wanted to give him some kind of present because that was the opposite of how things worked in his head anyway. He was supposed to be giving other people things, right?

The first book he unwrapped was called Exploring Space and he can't help but turn it over to read the summary.

"Oh, fascinating..." Senku said, looking thoughtful. It was about a whole planet and presumably star system he didn't know which was inherently interesting.