You were hanging around Chuuya Nakahara and Motojirou Kajii. Kajii wasn't talking much since he was more focused on his experiment. Chuuya was more of the one chatting with you. It wasn't clarified why you were hanging with Chuuya in Kajii's lab.

Chuuya soon walked off, he excused him as having to do something — which left you and Kajii there.

He still was doing his own thing, not engaging in conversation.