not quite the other stalker dude has a slightly different hair cut then the main stalker dude. I think they might be brothers or even twins. the other dude has hair in the back of his head while main's is sorta buzzed/shorted off
I didn't pay attention but kinda looks like it. I mean, the scene when we see the table and only one of them sitting, it's like we got out of the stalker's POV and we realize he was alone. But overall that wouldn't make sense bc others chat with the other stalker (the main stalker's friend - geez, so confusing)
right i think it was easier to recognize this two person due to their hair styles or length ...it happens alot so m kinda used to it
http://www.mangago.zone/read-manga/stalker_s_game/uu/stalker_s_game-chapter-28/17/
He sitting by himself while chatting... multiples personalities?