lol and here I was expecting someone new and interesting for a change. I guess the author gave up and put someone that at least looks OK physically just to say: "Hey, he has a love rival!".
Who is he again? Why is he important here? To make a point that the MC likes Erika? It was done already though. There is no need from this random guy to casually join in your circle. How the heck do you went stay overnight with someone that is not in your circle anyway?