When Katsuro heard some talking behind him, he turned his head around to look. Just when he had been thinking about that guy, he was sitting there chatting on the phone. Seeing their positions, it was impossible for the other to have not seen him turn around, now he almost had to go over to say hello. That was the only polite thing to do. Katsuro supressed a little smile. Somehow he had the feeling that the other guy wouldn't really appreciate this. Still he got up threw the paper bag in which his breakfast had been in the trash and strolled over to where the other guy was. At a few metres distance he raised his hand in a casual greeting. The he took the seat next to the guy without asking and waited until he was done with his phone.