Judging by the Authors past works and the way manga like this usually go I'm going to take a guess it isn't going to be a GL. The kiss was more of a bait to grab readers attention. Probably going to be more similar to something like IDOLxIDOL Story which is tagged as GL. But if you've read it, it doesn't have any romantic developments at all. It's focused on the idols story. (I could be wrong but I'm more inclined to expect this to be the case as it's usually how manga like this go and the author has a history of sports/games manga with 0 romance).
Still seems like a fun manga though I'm going to keep up with it. I like the characters. But yeah wouldn't recommend people to pick this up if they're only doing so for yuri.