Is he with 3 people? Or the cover just looks like that?

It's one person technically

So the cover is depicting a gods three aspects basically. There’s hunger, lust, and pride and when one of these egos takes over their body changes to reflect the shift. There is one chapter I believe where the line significantly blurs between “is there really only one present?” And that is represented by the ML seeing all three of them at once. It does take place during boombayah scene.