I don't read the other group's stuff. I got used to how this group does it and I'm not even really that curious if the other group somehow does it better or worse. I also don't really mind the delay in comparison with the other one. I'm not in a hurry to read all that has come out anyway.
So now that that's out of the way:
What even happened? Did Shirogane just suddenly collapse or get a heart attack from being exhausted because he couldn't sleep so long? Or is it something funnier like this being part of the "I'm not really good at this thing" but this time it's kissing. I sure still remember the impossible movements of the Volleyball times, so this wouldn't really surprise me if that was to be the case.