Osamu is not pouting, but it's a near thing. He doesn't know how to handle being called out by Kita.

"Yeah, well, what if someone else fell like I did," he grumbles, though of course that's not really why he's upset. And Kita has that intense stare like he can see right through him.

It doesn't take long for him to cave.

"Tsumu's enjoying himself at camp," he finally grunts. "Can't even be bothered to answer my texts most days."