>>50970726My first comprehensive experience to idols is AKB49 - Renai Kinshi Jourei. It's a manga about a dude who cross dresses and joins AKB in order to support his high school crush who also recently joined.
It's not that in-depth but it's a good introduction to idol culture and I would recommend it to even someone who isn't that interested in idol culture.
No, it doesn't go gay. 