Happy? Ecstatic. If his victory cheer weren't enough of a give away, he also pumps a fist in the air excitedly. You're the best ever, Kaoru!

"Nah, he won't hurt us." It's said a bit too casually; Hikaru's pretty sure that he's going to get into trouble for at least the fish bill if nothing else, but that's different to 'us'. And he's pretty sure that there's nothing Kaoru can get into trouble for on this one; it's all him this time.