Okay so from my understanding when Kaido and Honda were in the café in chapter 11 someone secretly took a photo of them. Before this however, Kaido objected to having photos taken of him in his private life. I think his superiors planned to take the photos secretly then they were published along side an article in a magazine. Upon having found out about the secret photos, Kaido lashed out at his co workers and (here's where I'm not sure how him being gay came into the equation but) Kaido either divulged in his gay relationship or it was assumed by the others that he was gay because of the photos and article? Then I'm guessing that he was harassed by his co workers (hence the injuries.) Kaido hid the magazine from Honda as not to worry him, but that only made things worse and Honda ended up blaming himself for everything that happened to Kaido. As for Kaido's close colleague, I didn't quite understand the dialogue between the two of them so I can't really explain that, sorry. But in all honesty I'm still very confused by everything that's happened. The way things are phrased in the manga are quite ambiguous and vague ┑( ̄Д  ̄)┍
This actually really helped, because I was so lost.
I don't understand OMG someone's please explain and elaborate what's actually happening at Kaido's work to me. What happens with the senior? What happens with Murasakibara? What's the deal? Why it seems so complicated TT