This might be the ultimate manufactured drama to rule them all. I can't fucking believe it. Normally a good author would have the grandma coughing or some shit, more and more until the moment of collapse. This just happens out of nowhere.
But I'm being unfair here, plenty of manga I've enjoyed caused drama from out of nowhere. It's basically the author promising the reader "Dis Gon be GOOOOD", and I believed them: characters changed, emotions became strong.
I don't believe this mangaka. I know nothing will change from this. Let me list what is going to happen: Granny almost ded, Mizuhara Sad, Kazuya sad, stupid shit in between that won't matter, then by the time the film is shown they're going to be "closer than ever" (by, like, 1 nanometer). Kazuya will still be a big virgin, Mizuhara will still be perfect but sad, Ruka will keep being a rusty needle throttling inside the reader's ballsack (or uterus, everyone can suffer the same at this). Nothing will move forward, it might look like it, but that's bullshit.
I've gone too far now, I can't stop. If you're a new reader and are thinking about picking it up, I strongly advice against it. Atleast it's fun to rip apart with friends, but repeatedly rolling a dog turd with a stick is also very funny if you're with friends.