Isao didn't really have a reason for being there. He was mainly going along for the same reason he had gone on any of the other investigations. He had the ability to help and he had nothing better to do. Something was going to be different about this though. His views of the person in question over the past few times dealing with this stuff was basically... Well, he didn't have views. Reizo was just the person that stood around making gay jokes in between proving that he was really good at beating stuff up. After reading the assumptions that he was in that world, Isao was just running through the possible situations in his head at this point. He could have easily assumed that gay jokes and beating stuff up would be involved, but that was about all he had.
There may have been a tiny bit of morbid curiosity, but he just didn't have any strong opinions one way or the other. Still, he had quietly followed the others into the alley. There wasn't much to say about it, it was just... creepy? Maybe that was the word for it, but he kept a calm expression on his face. It certainly wasn't the sort of place where he would spend his free time, but he wasn't going to let it get to him. Or he was at least going to try to stay level-headed about the whole thing. Everyone else was being jumpy enough and he didn't need to add to that.
"Just keep going," he replied to Kou. They did need to watch where they were going, but he needed to follow the rule himself, too. It was in everyone's best interest to keep aware of their surroundings... or something like that. Isao looked over the area and sighed.